CVE-2019-17571: Included in Log4j 1.2 is a SocketServer class that is vulnerable to deserialization of untrusted data which can be exploited to remotely…
Noroxi assessment
Priority: This week (action score 60/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 69.9% (FIRST EPSS); higher than 99.3% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: apache-log4j1.2 (Debian:10) 1.2.17-8+deb10u1; apache-log4j1.2 (Debian:12) 1.2.17-9; apache-log4j1.2 (Debian:8) 1.2.17-5+deb8u1.
- Mentioned 6 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Don’t wait for the next maintenance window. Upgrade to apache-log4j1.2 (Debian:10) 1.2.17-8+deb10u1; apache-log4j1.2 (Debian:12) 1.2.17-9; apache-log4j1.2 (Debian:8) 1.2.17-5+deb8u1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
Included in Log4j 1.2 is a SocketServer class that is vulnerable to deserialization of untrusted data which can be exploited to remotely execute arbitrary code when combined with a deserialization gadget when listening to untrusted network traffic for log data. This affects Log4j versions up to 1.2 up to 1.2.17.
- Published
- Dec 20, 2019
- Updated
- Jun 16, 2026
- EPSS
- 69.9% · 99th percentile
- CWE
- CWE-502
Report tools
Action score
60
Don’t wait for the next maintenance window.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 21 / 30 · 69.9%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| apache | log4j | cpe:2.3:a:apache:log4j |
| apache | bookkeeper | cpe:2.3:a:apache:bookkeeper |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| opensuse | leap | cpe:2.3:o:opensuse:leap |
| netapp | oncommand system manager | cpe:2.3:a:netapp:oncommand_system_manager |
| netapp | oncommand workflow automation | cpe:2.3:a:netapp:oncommand_workflow_automation |
| oracle | application testing suite | cpe:2.3:a:oracle:application_testing_suite |
| oracle | communications network integrity | cpe:2.3:a:oracle:communications_network_integrity |
| oracle | endeca information discovery studio | cpe:2.3:a:oracle:endeca_information_discovery_studio |
| oracle | financial services lending and leasing | cpe:2.3:a:oracle:financial_services_lending_and_leasing |
| oracle | mysql enterprise monitor | cpe:2.3:a:oracle:mysql_enterprise_monitor |
and 5 more
Versions reported by the vendor
Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.
Apache Software Foundation Log4j
- versions up to 1.2.17affected
Affected versions · NVD (20)
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apache bookkeeperbefore 4.14.3
- apache log4jup to 1.2.17 inclusive
- canonical ubuntu linux18.04
- debian debian linux10.0
- debian debian linux8.0
- debian debian linux9.0
- netapp oncommand system manager3.0 and later · up to 3.1.3 inclusive
- netapp oncommand workflow automationall versions
- opensuse leap15.1
- oracle application testing suite13.3.0.1
- oracle communications network integrity7.3.2 and later · up to 7.3.6 inclusive
- oracle endeca information discovery studio3.2.0
- oracle financial services lending and leasing14.1.0 and later · up to 14.8.0 inclusive
- oracle financial services lending and leasing12.5.0
- oracle mysql enterprise monitorup to 8.0.29 inclusive
- oracle primavera gateway17.12.0 and later · up to 17.12.7 inclusive
- oracle primavera gateway16.2 and later · up to 16.2.11 inclusive
- oracle rapid planning12.1
- oracle rapid planning12.2
- oracle retail extract transform and load19.0
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:10 | apache-log4j1.2 | before 1.2.17-8+deb10u1 | 1.2.17-8+deb10u1 |
| Debian:12 | apache-log4j1.2 | before 1.2.17-9 | 1.2.17-9 |
| Debian:8 | apache-log4j1.2 | before 1.2.17-5+deb8u1 | 1.2.17-5+deb8u1 |
| Debian:9 | apache-log4j1.2 | before 1.2.17-7+deb9u1 | 1.2.17-7+deb9u1 |
| Maven | log4j:log4j | from 1.2 · up to and including 1.2.17 | — |
| Maven | org.zenframework.z8.dependencies.commons:log4j-1.2.17 | from 2.0 · up to and including 2.0 | — |
| openSUSE:Leap 15.1 | log4j | before 1.2.17-lp151.5.3.1 | 1.2.17-lp151.5.3.1 |
| openSUSE:Leap 15.1 | log4j-mini | before 1.2.17-lp151.5.3.1 | 1.2.17-lp151.5.3.1 |
| Red Hat:enterprise_linux:7::client | log4j | before 0:1.2.17-16.el7_4 | 0:1.2.17-16.el7_4 |
| Red Hat:enterprise_linux:7::client | log4j-javadoc | before 0:1.2.17-16.el7_4 | 0:1.2.17-16.el7_4 |
| Red Hat:enterprise_linux:7::client | log4j-manual | before 0:1.2.17-16.el7_4 | 0:1.2.17-16.el7_4 |
| Red Hat:jboss_enterprise_application_platform:5::el5 | log4j | before 0:1.2.14-19.patch_01.ep5.el5 | 0:1.2.14-19.patch_01.ep5.el5 |
| Red Hat:jboss_enterprise_application_platform:5::el6 | log4j | before 0:1.2.14-19.patch_01.ep5.el6 | 0:1.2.14-19.patch_01.ep5.el6 |
| Red Hat:jboss_enterprise_application_platform:6::el6 | jboss-ec2-eap | before 0:7.5.17-1.Final_redhat_4.ep6.el6 | 0:7.5.17-1.Final_redhat_4.ep6.el6 |
| Red Hat:jboss_enterprise_application_platform:6::el6 | jboss-ec2-eap-samples | before 0:7.5.17-1.Final_redhat_4.ep6.el6 | 0:7.5.17-1.Final_redhat_4.ep6.el6 |
| Red Hat:jboss_enterprise_application_platform:7::el6 | eap7-jboss-ec2-eap | before 0:7.0.8-1.GA_redhat_1.ep7.el6 | 0:7.0.8-1.GA_redhat_1.ep7.el6 |
| Red Hat:jboss_enterprise_application_platform:7::el6 | eap7-jboss-ec2-eap-samples | before 0:7.0.8-1.GA_redhat_1.ep7.el6 | 0:7.0.8-1.GA_redhat_1.ep7.el6 |
| Red Hat:jboss_enterprise_application_platform:7::el7 | eap7-jboss-ec2-eap | before 0:7.0.8-1.GA_redhat_1.ep7.el7 | 0:7.0.8-1.GA_redhat_1.ep7.el7 |
| Red Hat:jboss_enterprise_application_platform:7::el7 | eap7-jboss-ec2-eap-samples | before 0:7.0.8-1.GA_redhat_1.ep7.el7 | 0:7.0.8-1.GA_redhat_1.ep7.el7 |
| Red Hat:jboss_enterprise_web_server:3.1::el6 | log4j-eap6 | before 0:1.2.16-12.redhat_3.1.ep6.el6 | 0:1.2.16-12.redhat_3.1.ep6.el6 |
| Red Hat:jboss_enterprise_web_server:3.1::el6 | tomcat-native | before 0:1.2.8-10.redhat_10.ep7.el6 | 0:1.2.8-10.redhat_10.ep7.el6 |
| Red Hat:jboss_enterprise_web_server:3.1::el6 | tomcat-native-debuginfo | before 0:1.2.8-10.redhat_10.ep7.el6 | 0:1.2.8-10.redhat_10.ep7.el6 |
| Red Hat:jboss_enterprise_web_server:3.1::el6 | tomcat7 | before 0:7.0.70-22.ep7.el6 | 0:7.0.70-22.ep7.el6 |
| Red Hat:jboss_enterprise_web_server:3.1::el6 | tomcat7-admin-webapps | before 0:7.0.70-22.ep7.el6 | 0:7.0.70-22.ep7.el6 |
+56
Same product
apache: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-44228Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpointsKEV100Now
- CVE-2021-45046Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attackKEV96Now
- CVE-2017-5645In Apache Log4j 2.x before 2.8.2, when using the TCP socket server or UDP socket server to receive serialized log events from another…66This week
Published before and after this one in the same product
- Later →CVE-2020-9488Apr 27, 2020 · Improper validation of certificate with host mismatch in Apache Log4j SMTP appender.16Monitor
- Later →CVE-2021-4104Dec 14, 2021 · Deserialization of untrusted data in JMSAppender in Apache Log4j 1.254Plan
- Later →CVE-2021-45105Dec 18, 2021 · Apache Log4j2 does not always protect from infinite recursion in lookup evaluation53Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:apache-log4j1.2 | 1.2.17-9 · Debian:12 | Package registry (OSV) |
| opensuse:log4j | 1.2.17-lp151.5.3.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:log4j-mini | 1.2.17-lp151.5.3.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| red hat:log4j-eap6 | 0:1.2.16-12.redhat_3.1.ep6.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat-native | 0:1.2.8-10.redhat_10.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat-native-debuginfo | 0:1.2.8-10.redhat_10.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7 | 0:7.0.70-22.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-admin-webapps | 0:7.0.70-22.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-docs-webapp | 0:7.0.70-22.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-el-2.2-api | 0:7.0.70-22.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-javadoc | 0:7.0.70-22.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-jsp-2.2-api | 0:7.0.70-22.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-jsvc | 0:7.0.70-22.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-lib | 0:7.0.70-22.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-log4j | 0:7.0.70-22.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| suse:log4j | 1.2.17-5.3.1 · SUSE:Linux Enterprise Module for Basesystem 15 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×3
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | 3 repositories | 2019-12-25 → 2021-12-14 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- First PoC+4 d
- TodayNov 14, 2026+2520 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-22-0435 · Jun 17, 2022(RedHat Güvenlik Güncellemesi)
- TR-22-0001 · Jan 3, 2022(IBM Güvenlik Bildirimi)
- TR-21-0525 · Jun 28, 2021(IBM Güvenlik Bülteni Yayınladı)
- TR-21-0331 · Apr 21, 2021(Oracle Güvenlik Uyarısı Yayınladı)
- TR-20-571 · Aug 6, 2020(IBM Ürünleri Güvenlik Güncellemesi)
- TR-20-360 · May 18, 2020(Apache Log4j Güvenlik Güncellemesi)
Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-502 · Deserialization of Untrusted DataCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Root cause
Data received over the network is deserialized into the language’s native object format without verifying its source. Code paths inside the object can be triggered during deserialization.
The bug in code
The whole CWE-502 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
payload = sock.recv(65536)
job = pickle.loads(payload)Fixed
payload = sock.recv(65536)
if not hmac.compare_digest(sign(payload), header_sig):
raise PermissionError("invalid signature")
job = JobSchema.validate(json.loads(payload))Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- lists.apache.org/thread.html/277b4b5c2b0e06a825ccec565fa65bd671f35a4d58e3e2ec5d0618e1%40%3Cdev.tika.apache.org%3E
- lists.apache.org/thread.html/44491fb9cc19acc901f7cff34acb7376619f15638439416e3e14761c%40%3Cdev.tika.apache.org%3E
- lists.apache.org/thread.html/479471e6debd608c837b9815b76eab24676657d4444fcfd5ef96d6e6%40%3Cdev.tika.apache.org%3E
- lists.apache.org/thread.html/564f03b4e9511fcba29c68fc0299372dadbdb002718fa8edcc4325e4%40%3Cjira.kafka.apache.org%3E
- lists.apache.org/thread.html/6114ce566200d76e3cc45c521a62c2c5a4eac15738248f58a99f622c%40%3Cissues.activemq.apache.org%3E
- lists.apache.org/thread.html/752ec92cd1e334a639e79bfbd689a4ec2c6579ec5bb41b53ffdf358d%40%3Cdev.kafka.apache.org%3E
- lists.apache.org/thread.html/8ab32b4c9f1826f20add7c40be08909de9f58a89dc1de9c09953f5ac%40%3Cissues.activemq.apache.org%3E
- lists.apache.org/thread.html/eea03d504b36e8f870e8321d908e1def1addda16adda04327fe7c125%40%3Cdev.logging.apache.org%3E
- lists.apache.org/thread.html/r05755112a8c164abc1004bb44f198b1e3d8ca3d546a8f13ebd3aa05f%40%3Cissues.zookeeper.apache.org%3E
- lists.apache.org/thread.html/r107c8737db39ec9ec4f4e7147b249e29be79170b9ef4b80528105a2d%40%3Cdev.zookeeper.apache.org%3E
- lists.apache.org/thread.html/r13d4b5c60ff63f3c4fab51d6ff266655be503b8a1884e2f2fab67c3a%40%3Ccommon-issues.hadoop.apache.org%3E
- lists.apache.org/thread.html/r189aaeaad897f7d6b96f7c43a8ef2dfb9f6e9f8c1cc9ad182ce9b9ae%40%3Cjira.kafka.apache.org%3E
- lists.apache.org/thread.html/r18f1c010b554a3a2d761e8ffffd8674fd4747bcbcf16c643d708318c%40%3Cissues.activemq.apache.org%3E
- lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E
- lists.apache.org/thread.html/r1b7734dfdfd938640f2f5fb6f4231a267145c71ed60cc7faa1cbac07%40%3Ccommon-issues.hadoop.apache.org%3E
- lists.apache.org/thread.html/r26244f9f7d9a8a27a092eb0b2a0ca9395e88fcde8b5edaeca7ce569c%40%3Ccommon-issues.hadoop.apache.org%3E
- lists.apache.org/thread.html/r2721aba31a8562639c4b937150897e24f78f747cdbda8641c0f659fe%40%3Cusers.kafka.apache.org%3E
- lists.apache.org/thread.html/r2756fd570b6709d55a61831ca028405bcb3e312175a60bc5d911c81f%40%3Cjira.kafka.apache.org%3E
- lists.apache.org/thread.html/r2ce8d26154bea939536e6cf27ed02d3192bf5c5d04df885a80fe89b3%40%3Cissues.activemq.apache.org%3E
Vendor advisories and official records. Exploit/PoC links are deliberately left out.