curl 7.21.0 to and including 7.73.0 is vulnerable to uncontrolled recursion due to a stack overflow issue in FTP wildcard match parsing.
Noroxi assessment
Priority: Monitor (action score 33/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 9.7% (FIRST EPSS); higher than 95.5% 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: curl (Alpine:v3.10) 7.66.0-r3; curl (Alpine:v3.11) 7.67.0-r3; curl (Alpine:v3.12) 7.69.1-r3.
- Mentioned 6 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to curl (Alpine:v3.10) 7.66.0-r3; curl (Alpine:v3.11) 7.67.0-r3; curl (Alpine:v3.12) 7.69.1-r3 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
- Published
- Dec 14, 2020
- Updated
- Oct 14, 2026
- EPSS
- 9.7% · 95th percentile
- CWE
- CWE-674
Report tools
Action score
33
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 3 / 30 · 9.7%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.5
- CNA · hackerone
- 7.5
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi 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 |
|---|---|---|
| haxx | libcurl | cpe:2.3:a:haxx:libcurl |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| netapp | clustered data ontap | cpe:2.3:a:netapp:clustered_data_ontap |
| netapp | hci management node | cpe:2.3:a:netapp:hci_management_node |
| netapp | solidfire | cpe:2.3:a:netapp:solidfire |
| netapp | hci bootstrap os | cpe:2.3:o:netapp:hci_bootstrap_os |
| netapp | hci compute node | cpe:2.3:h:netapp:hci_compute_node |
| netapp | hci storage node firmware | cpe:2.3:o:netapp:hci_storage_node_firmware |
| netapp | hci storage node | cpe:2.3:h:netapp:hci_storage_node |
| apple | mac os x | cpe:2.3:o:apple:mac_os_x |
| apple | macos | cpe:2.3:o:apple:macos |
and 18 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apple mac os x10.15 and later · before 10.15.7
- apple mac os xbefore 10.14.6
- apple mac os x10.14.6
- apple mac os x10.15.7
- apple macos11.0 and later · before 11.3
- debian debian linux10.0
- debian debian linux9.0
- fedoraproject fedora32
- fedoraproject fedora33
- fujitsu m10-1 firmwarebefore xcp3110
- fujitsu m10-1 firmwarebefore xcp2410
- fujitsu m10-4 firmwarebefore xcp2410
- fujitsu m10-4 firmwarebefore xcp3110
- fujitsu m10-4s firmwarebefore xcp2410
- fujitsu m10-4s firmwarebefore xcp3110
- fujitsu m12-1 firmwarebefore xcp3110
- fujitsu m12-1 firmwarebefore xcp2410
- fujitsu m12-2 firmwarebefore xcp3110
- fujitsu m12-2 firmwarebefore xcp2410
- fujitsu m12-2s firmwarebefore xcp3110
Versions reported by the vendor
Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.
n/a https://github.com/curl/curl
- libcurl 7.21.0 to and including 7.73.0affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | curl | before 7.66.0-r3 | 7.66.0-r3 |
| Alpine:v3.11 | curl | before 7.67.0-r3 | 7.67.0-r3 |
| Alpine:v3.12 | curl | before 7.69.1-r3 | 7.69.1-r3 |
| Alpine:v3.13 | curl | before 7.74.0-r0 | 7.74.0-r0 |
| Debian:10 | curl | before 7.64.0-4+deb10u2 | 7.64.0-4+deb10u2 |
| Debian:12 | curl | before 7.74.0-1 | 7.74.0-1 |
| Debian:9 | curl | before 7.52.1-5+deb9u13 | 7.52.1-5+deb9u13 |
| openSUSE:Leap 15.1 | curl | before 7.60.0-lp151.5.18.1 | 7.60.0-lp151.5.18.1 |
| openSUSE:Leap 15.1 | curl-mini | before 7.60.0-lp151.5.18.1 | 7.60.0-lp151.5.18.1 |
| openSUSE:Leap 15.2 | curl | before 7.66.0-lp152.3.12.1 | 7.66.0-lp152.3.12.1 |
| openSUSE:Leap 15.2 | curl-mini | before 7.66.0-lp152.3.12.1 | 7.66.0-lp152.3.12.1 |
| Red Hat:enterprise_linux:8::baseos | curl | before 0:7.61.1-18.el8 | 0:7.61.1-18.el8 |
| Red Hat:enterprise_linux:8::baseos | curl-debuginfo | before 0:7.61.1-18.el8 | 0:7.61.1-18.el8 |
| Red Hat:enterprise_linux:8::baseos | curl-debugsource | before 0:7.61.1-18.el8 | 0:7.61.1-18.el8 |
| Red Hat:enterprise_linux:8::baseos | curl-minimal-debuginfo | before 0:7.61.1-18.el8 | 0:7.61.1-18.el8 |
| Red Hat:enterprise_linux:8::baseos | libcurl | before 0:7.61.1-18.el8 | 0:7.61.1-18.el8 |
| Red Hat:enterprise_linux:8::baseos | libcurl-debuginfo | before 0:7.61.1-18.el8 | 0:7.61.1-18.el8 |
| Red Hat:enterprise_linux:8::baseos | libcurl-devel | before 0:7.61.1-18.el8 | 0:7.61.1-18.el8 |
| Red Hat:enterprise_linux:8::baseos | libcurl-minimal | before 0:7.61.1-18.el8 | 0:7.61.1-18.el8 |
| Red Hat:enterprise_linux:8::baseos | libcurl-minimal-debuginfo | before 0:7.61.1-18.el8 | 0:7.61.1-18.el8 |
| Red Hat:jboss_core_services:1::el7 | jbcs-httpd24 | before 0:1-18.jbcs.el7 | 0:1-18.jbcs.el7 |
| Red Hat:jboss_core_services:1::el7 | jbcs-httpd24-apr | before 0:1.6.3-105.jbcs.el7 | 0:1.6.3-105.jbcs.el7 |
| Red Hat:jboss_core_services:1::el7 | jbcs-httpd24-apr-debuginfo | before 0:1.6.3-105.jbcs.el7 | 0:1.6.3-105.jbcs.el7 |
| Red Hat:jboss_core_services:1::el7 | jbcs-httpd24-apr-devel | before 0:1.6.3-105.jbcs.el7 | 0:1.6.3-105.jbcs.el7 |
+96
Same product
haxx: all recordsOther highest-scoring records for the same primary product.
- CVE-2023-38545This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy
handshake.63This week
- CVE-2019-5436A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1.46Plan
- CVE-2019-3822libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow.43Plan
Published before and after this one in the same product
- ← EarlierCVE-2019-3823Feb 6, 2019 · libcurl versions from 7.34.0 to before 7.64.0 are vulnerable to a heap out-of-bounds read in the code handling the end-of-response for SMTP.31Monitor
- ← EarlierCVE-2020-8231Dec 14, 2020 · Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending data.32Monitor
- Later →CVE-2020-8286Dec 14, 2020 · curl 7.41.0 through 7.73.0 is vulnerable to an improper check for certificate revocation due to insufficient verification of the OCSP respon31Monitor
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:curl | 7.66.0-r3 · Alpine:v3.10 | Package registry (OSV) |
| debian:curl | 7.74.0-1 · Debian:12 | Package registry (OSV) |
| opensuse:curl | 7.66.0-lp152.3.12.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:curl-mini | 7.66.0-lp152.3.12.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| red hat:curl | 0:7.61.1-18.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:curl-debuginfo | 0:7.61.1-18.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:curl-debugsource | 0:7.61.1-18.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:curl-minimal-debuginfo | 0:7.61.1-18.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:jbcs-httpd24 | 0:1-18.jbcs.el7 · Red Hat:jboss_core_services:1::el7 | Package registry (OSV) |
| red hat:jbcs-httpd24-apr | 0:1.6.3-105.jbcs.el7 · Red Hat:jboss_core_services:1::el7 | Package registry (OSV) |
| red hat:jbcs-httpd24-apr-debuginfo | 0:1.6.3-105.jbcs.el7 · Red Hat:jboss_core_services:1::el7 | Package registry (OSV) |
| red hat:libcurl | 0:7.61.1-18.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:libcurl-debuginfo | 0:7.61.1-18.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:libcurl-devel | 0:7.61.1-18.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:libcurl-minimal | 0:7.61.1-18.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:libcurl-minimal-debuginfo | 0:7.61.1-18.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| rocky linux:curl | 0:7.61.1-18.el8 · Rocky Linux:8 | Package registry (OSV) |
| suse:curl | 7.60.0-3.35.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP1 | Package registry (OSV) |
| suse:curl-openssl1 | 7.37.0-70.57.1 · SUSE:Linux Enterprise Server 11-SECURITY | 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.
No commit or PR link among the references.
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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-22-0215 · Mar 11, 2022(Siemens Güvenlik Bildirimi)
- TR-22-0069 · Jan 20, 2022(Oracle Güvenlik Zafiyeti)
- TR-21-0772 · Sep 23, 2021(RedHat Güvenlik Zafiyeti)
- TR-21-0448 · Jun 7, 2021(IBM Güvenlik Bülteni Yayınladı)
- TR-21-0331 · Apr 21, 2021(Oracle Güvenlik Uyarısı Yayınladı)
- TR-21-0243 · Mar 18, 2021(IBM Güvenlik Bülteni Yayınladı)
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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-674 · Uncontrolled RecursionCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- curl.se/docs/CVE-2020-8285.html
- hackerone.com/reports/1045844
- lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- lists.debian.org/debian-lts-announce/2020/12/msg00029.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DAEHE2S2QLO4AO4MEEYL75NB7SAH5PSL/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NZUVSQHN2ESHMJXNQ2Z7T2EELBB5HJXG/
- security.gentoo.org/glsa/202012-14
- security.netapp.com/advisory/ntap-20210122-0007/
- support.apple.com/kb/HT212325
- support.apple.com/kb/HT212326
- support.apple.com/kb/HT212327
- www.debian.org/security/2021/dsa-4881
- www.oracle.com//security-alerts/cpujul2021.html
- www.oracle.com/security-alerts/cpuApr2021.html
- www.oracle.com/security-alerts/cpuapr2022.html
- www.oracle.com/security-alerts/cpujan2022.html
- cert-portal.siemens.com/productcert/html/ssa-389290.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.