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Case File

CVE-2016-4979

HIGH · CVSS 7.5 EPSS 18.80% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2016-07-06 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 7.5. It affects Apache. Public exploit code or proof-of-concept references have been detected in its references. Its EPSS score suggests a 18.8% probability of exploitation in the next 30 days. It may be remotely exploitable.

Public Exploit Signal

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

GitHub PoC Links
External Security References

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

CVE
CVE-2016-4979
Severity
HIGH
CVSS
7.5
EPSS
18.80%
Apache

Original NVD Description

The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the "SSLVerifyClient require" directive for HTTP/2 request authorization, which allows remote attackers to bypass intended access restrictions by leveraging the ability to send multiple requests over a single connection and aborting a renegotiation.