OpenSSL 1.0.2 (starting from version 1.0.2b) introduced an "error state" mechanism.
OpenSSL 1.0.2 (starting from version 1.0.2b) introduced an "error state" mechanism. The intent was that if a fatal error occurred during a handshake then OpenSSL would move into the error state and would immediately fail if you attempted to continue the handshake. This works as designed for the explicit handshake functions (SSL_do_handshake(), SSL_accept() and SSL_connect()), however due to a bug it does not work correctly if SSL_read() or SSL_write() is called directly. In that scenario, if the handshake fails then a fatal error will be returned in the initial function call. If SSL_read()/SSL_write() is subsequently called by the application for the same SSL object then it will succeed and the data is passed without being decrypted/encrypted directly from the SSL/TLS record layer. In order to exploit this issue an application bug would have to be present that resulted in a call to SSL_read()/SSL_write() being issued after having already received a fatal error. OpenSSL version 1.0.2b-1.0.2m are affected. Fixed in OpenSSL 1.0.2n. OpenSSL 1.1.0 is not affected.
- Published
- Dec 7, 2017
- Updated
- Jun 16, 2026
- EPSS
- 78.7% · 100th percentile
- CWE
- CWE-125
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Report tools
Action score
47
Plan
Add it to your regular patch cycle.
- CVSS
- 23 / 40 · 5.9 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 24 / 30 · 78.7%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| openssl | openssl | cpe:2.3:a:openssl:openssl |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux9.0
- openssl openssl1.0.2b
- openssl openssl1.0.2c
- openssl openssl1.0.2d
- openssl openssl1.0.2e
- openssl openssl1.0.2f
- openssl openssl1.0.2g
- openssl openssl1.0.2h
- openssl openssl1.0.2i
- openssl openssl1.0.2j
- openssl openssl1.0.2k
- openssl openssl1.0.2l
- openssl openssl1.0.2m
Versions reported by the vendor
Affected version ranges reported by the assigning authority (openssl). Independent of NVD's CPE analysis and usually ahead of it.
OpenSSL Software Foundation OpenSSL
- 1.0.2b-1.0.2maffected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.3 | openssl | before 1.0.2n-r0 | 1.0.2n-r0 |
| Debian:12 | openssl | before 1.1.0b-2 | 1.1.0b-2 |
| Debian:9 | openssl1.0 | before 1.0.2l-2+deb9u2 | 1.0.2l-2+deb9u2 |
| openSUSE:Tumbleweed | openssl-1_0_0 | before 1.0.2u-6.2 | 1.0.2u-6.2 |
| Red Hat:enterprise_linux:7::client | openssl | before 1:1.0.2k-12.el7 | 1:1.0.2k-12.el7 |
| Red Hat:enterprise_linux:7::client | openssl-debuginfo | before 1:1.0.2k-12.el7 | 1:1.0.2k-12.el7 |
| Red Hat:enterprise_linux:7::client | openssl-devel | before 1:1.0.2k-12.el7 | 1:1.0.2k-12.el7 |
| Red Hat:enterprise_linux:7::client | openssl-libs | before 1:1.0.2k-12.el7 | 1:1.0.2k-12.el7 |
| Red Hat:enterprise_linux:7::client | openssl-perl | before 1:1.0.2k-12.el7 | 1:1.0.2k-12.el7 |
| Red Hat:enterprise_linux:7::client | openssl-static | before 1:1.0.2k-12.el7 | 1:1.0.2k-12.el7 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apache-commons-daemon | before 0:1.1.0-1.redhat_2.1.jbcs.el6 | 0:1.1.0-1.redhat_2.1.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apache-commons-daemon-jsvc | before 1:1.1.0-1.redhat_2.jbcs.el6 | 1:1.1.0-1.redhat_2.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apache-commons-daemon-jsvc-debuginfo | before 1:1.1.0-1.redhat_2.jbcs.el6 | 1:1.1.0-1.redhat_2.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr | before 0:1.6.3-14.jbcs.el6 | 0:1.6.3-14.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-debuginfo | before 0:1.6.3-14.jbcs.el6 | 0:1.6.3-14.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-devel | before 0:1.6.3-14.jbcs.el6 | 0:1.6.3-14.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util | before 0:1.6.1-9.jbcs.el6 | 0:1.6.1-9.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-debuginfo | before 0:1.6.1-9.jbcs.el6 | 0:1.6.1-9.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-devel | before 0:1.6.1-9.jbcs.el6 | 0:1.6.1-9.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-ldap | before 0:1.6.1-9.jbcs.el6 | 0:1.6.1-9.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-mysql | before 0:1.6.1-9.jbcs.el6 | 0:1.6.1-9.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-nss | before 0:1.6.1-9.jbcs.el6 | 0:1.6.1-9.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-odbc | before 0:1.6.1-9.jbcs.el6 | 0:1.6.1-9.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-openssl | before 0:1.6.1-9.jbcs.el6 | 0:1.6.1-9.jbcs.el6 |
+85
Same product
openssl: all recordsOther highest-scoring records for the same primary product.
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- CVE-2016-2108The ASN.1 implementation in OpenSSL before 1.0.1o and 1.0.2 before 1.0.2c allows remote attackers to execute arbitrary code or cause a denia62This week
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- CVE-2022-3786X.509 Email Address Variable Length Buffer Overflow58Plan
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 |
|---|---|---|
| alpine:openssl | 1.0.2n-r0 · Alpine:v3.3 | Package registry (OSV) |
| debian:openssl | 1.1.0b-2 · Debian:12 | Package registry (OSV) |
| debian:openssl1.0 | 1.0.2l-2+deb9u2 · Debian:9 | Package registry (OSV) |
| opensuse:openssl-1_0_0 | 1.0.2u-6.2 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:jbcs-httpd24-apache-commons-daemon | 0:1.1.0-1.redhat_2.1.jbcs.el7 · Red Hat:jboss_core_services:1::el7 | Package registry (OSV) |
| red hat:jbcs-httpd24-apache-commons-daemon-jsvc | 1:1.1.0-1.redhat_2.jbcs.el7 · Red Hat:jboss_core_services:1::el7 | Package registry (OSV) |
| red hat:jbcs-httpd24-apache-commons-daemon-jsvc-debuginfo | 1:1.1.0-1.redhat_2.jbcs.el7 · Red Hat:jboss_core_services:1::el7 | Package registry (OSV) |
| red hat:jbcs-httpd24-apr | 0:1.6.3-14.jbcs.el7 · Red Hat:jboss_core_services:1::el7 | Package registry (OSV) |
| red hat:jbcs-httpd24-apr-debuginfo | 0:1.6.3-14.jbcs.el7 · Red Hat:jboss_core_services:1::el7 | Package registry (OSV) |
| red hat:jbcs-httpd24-apr-devel | 0:1.6.3-14.jbcs.el7 · Red Hat:jboss_core_services:1::el7 | Package registry (OSV) |
| red hat:openssl | 1:1.0.2k-12.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-debuginfo | 1:1.0.2k-12.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-devel | 1:1.0.2k-12.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-libs | 1:1.0.2k-12.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-perl | 1:1.0.2k-12.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-static | 1:1.0.2k-12.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| suse:openssl | 1.0.2j-60.20.2 · SUSE:Linux Enterprise Desktop 12 SP2 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
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.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
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.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
nvd-primary
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
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- www.tenable.com/security/tns-2017-16
- www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
- www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- www.securityfocus.com/bid/102103
- www.securitytracker.com/id/1039978
- access.redhat.com/errata/RHSA-2018:0998
- access.redhat.com/errata/RHSA-2018:2185
- access.redhat.com/errata/RHSA-2018:2186
- access.redhat.com/errata/RHSA-2018:2187
- cert-portal.siemens.com/productcert/pdf/ssa-179516.pdf
- github.com/openssl/openssl/commit/898fb884b706aaeb283de4812340bb0bde8476dc
- security.FreeBSD.org/advisories/FreeBSD-SA-17:12.openssl.asc
- security.gentoo.org/glsa/201712-03
- security.netapp.com/advisory/ntap-20171208-0001/
- security.netapp.com/advisory/ntap-20180117-0002/
- security.netapp.com/advisory/ntap-20180419-0002/
- www.debian.org/security/2017/dsa-4065
- www.digitalmunition.me/2017/12/cve-2017-3737-openssl-security-bypass-vulnerability/
- www.openssl.org/news/secadv/20171207.txt
Vendor advisories and official records. Exploit/PoC links are deliberately left out.