CVE-2021-23841: Null pointer deref in X509_issuer_and_serial_hash()

Brocade Fabric OS

2 more products


13 September 2022

13 September 2022



Base Score: 5.9 - MEDIUM - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H




Security Advisory ID : BSA-2022-1303

Component : OpenSSL

Revision : 1.0

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. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).

Affected Products

  • All versions of Brocade Fabric OS
  • Brocade Active Support Connectivity Gateway (ASC-G) before v.2.1.0

Products Confirmed Not Vulnerable

No other Brocade Fibre Channel Products from Broadcom products are known to be affected by this vulnerability.


Security update provided in Brocade Fabric OS: v9.1.1, v9.0.1e, v8.2.3c, v8.2.0_cbn5, 7.4.2j, Brocade ASCG: v.2.1.0 and later releases.

Revision History





Initial Publication

Sept 13, 2022