Is CVE-2021-26691 actively exploited?

CVE-2021-26691 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-26691?

CVE-2021-26691 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-26691?

Patch guidance is available from apache security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-26691.

Fix CVE-2021-26691 - CRITICAL apache http server

Q: Which products are affected by CVE-2021-26691?

12 products: apache http server, debian debian linux, debian debian linux, fedoraproject fedora, fedoraproject fedora, and 7 more.

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

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-122 CWE-787 · Out-of-bounds Write

Metadata

Primary Vendor: APACHE
Published: 6/10/2021
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

apache : http_serverdebian : debian_linuxdebian : debian_linuxfedoraproject : fedorafedoraproject : fedoraoracle : enterprise_manager_ops_centeroracle : instantis_enterprisetrackoracle : instantis_enterprisetrackoracle : instantis_enterprisetrackoracle : secure_backuporacle : zfs_storage_appliance_kitnetapp : cloud_backup

Remediation Guidance

Executive Summary

View on NIST NVD