AUGUST 5, 2026
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Case File

CVE-2021-26691

CRITICAL · CVSS 9.8 EPSS 68.29%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-06-10 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.8. It affects Apache. Its EPSS score suggests a 68.3% probability of exploitation in the next 30 days.

CVE
CVE-2021-26691
Severity
CRITICAL
CVSS
9.8
EPSS
68.29%
Apache

Original NVD Description

In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow

Related CVEs

Other vulnerabilities affecting the same vendor(s)