onyx --cves cve-2021-23840
CVE-2021-23840
- score
- <0.1
- cvss
- 7.5
- epss
- 50.7%
- published
- 2021-02-16
- kev added
- —
- first seen
OpenSSL versions 1.1.1i and below and 1.0.2x and below contain an overflow caused by EVP_CipherUpdate, EVP_EncryptUpdate, and EVP_DecryptUpdate when input length is near maximum integer value, letting applications behave incorrectly or crash, exploit requires specific input length conditions.
Timeline
How this CVE moved toward exploitation. Chart: last 30 days — trend score, EPSS, community mentions per day; hover the event lane.
- Published
- Tracked by Onyx
- Public PoC
Exploit availability
Public PoC flagged by vulnx; no direct exploit link among the citations.
Weaknesses
References 20
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://kc.mcafee.com/corporate/index?page=content&id=SB10366
- https://security.netapp.com/advisory/ntap-20210219-0009/
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://www.tenable.com/security/tns-2021-09
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=6a51b9e1d0cf0bf8515f7201b68fb0a3482b3dc1
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://security.gentoo.org/glsa/202103-03
- https://www.debian.org/security/2021/dsa-4855
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.tenable.com/security/tns-2021-10
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://security.netapp.com/advisory/ntap-20240621-0006/
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=9b1129239f3ebb1d1c98ce9ed41d5c9476c47cb2
- https://www.openssl.org/news/secadv/20210216.txt
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.tenable.com/security/tns-2021-03