AUGUST 4, 2026
Live Feed
Back to database
Case File

CVE-2021-32791

MEDIUM · CVSS 5.9 EPSS 1.50% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-07-26 · Last synced 2026-08-04

CyberRota Analysis

This is a medium severity vulnerability with a CVSS score of 5.9. It affects Apache. Public exploit code or proof-of-concept references have been detected in its references.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-32791
Severity
MEDIUM
CVSS
5.9
EPSS
1.50%
Apache

Original NVD Description

mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In mod_auth_openidc before version 2.4.9, the AES GCM encryption in mod_auth_openidc uses a static IV and AAD. It is important to fix because this creates a static nonce and since aes-gcm is a stream cipher, this can lead to known cryptographic issues, since the same key is being reused. From 2.4.9 onwards this has been patched to use dynamic values through usage of cjose AES encryption routines.

Related CVEs

Other vulnerabilities affecting the same vendor(s)