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CVE-2020-1967Segmentation fault in SSL_check_chain
- 7.5HighCVSS base score
- 53.3%Exploitation in 30 daysEPSS · top 1.0% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).
Timeline
ID reserved
By openssl
- 5 months later
· 5 months later
Published
- 6 years later
· 6 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 53.3% · top 1.0% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- crates.ioopenssl-srcGHSA-jq65-29v4-4x35 (opens in a new tab)
References
References32
- FreeBSD-SA-20:11 (opens in a new tab)vendor-advisoryx_refsource_FREEBSDx_transferred
- DSA-4661 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- [oss-security] 20200422 [CVE-2020-1967] OpenSSL 1.1.1d+ Segmentation fault in SSL_check_chain (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-dev] 20200422 Time for Tomcat Native 1.2.24? (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-dev] 20200422 Re: Time for Tomcat Native 1.2.24? (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-dev] 20200423 Re: Time for Tomcat Native 1.2.24? (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- GLSA-202004-10 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- FEDORA-2020-fcc91a28e8 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- FEDORA-2020-da2d1ef2d7 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- 20200501 CVE-2020-1967: proving sigalg != NULL (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- FEDORA-2020-d7b29838f6 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- openSUSE-SU-2020:0933 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- openSUSE-SU-2020:0945 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- https://www.oracle.com/security-alerts/cpujul2020.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.tenable.com/security/tns-2020-03 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.openssl.org/news/secadv/20200421.txt (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://security.netapp.com/advisory/ntap-20200424-0003/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/irsl/CVE-2020-1967 (opens in a new tab)x_refsource_MISCx_transferred
- http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.synology.com/security/advisory/Synology_SA_20_05 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.tenable.com/security/tns-2020-04 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.oracle.com/security-alerts/cpuoct2020.html (opens in a new tab)x_refsource_MISCx_transferred
- https://security.netapp.com/advisory/ntap-20200717-0004/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.oracle.com/security-alerts/cpujan2021.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.tenable.com/security/tns-2020-11 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.oracle.com/security-alerts/cpuApr2021.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.tenable.com/security/tns-2021-10 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.oracle.com//security-alerts/cpujul2021.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.oracle.com/security-alerts/cpuoct2021.html (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-1780 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-jq65-29v4-4x35 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2020-1967)Record last updated .