CVE-2021-23841

Public on 2021-02-19
Modified on 2021-03-19
Description
The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack.
Severity
Medium
CVSS v3 Base Score
5.9
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 openssl11 2021-03-18 01:40 ALAS2-2021-1612
Amazon Linux 2 openssl 2021-02-19 01:21 ALAS2-2021-1608
Amazon Linux 1 openssl 2021-02-23 20:18 ALAS-2021-1482

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD CVSSv2 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P
NVD CVSSv3 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H