CVE-2021-26691

Advisory lineage Upstream: 0 Downstream: 16
Modified
Published: 10 Jun 2021, 07:10
Last modified:03 Aug 2024, 20:33

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
v3.1 (nvd)
EPSS Score
47.82% HIGH
48% probability +11.55%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

10 Jun 2021, 07:10
Published
Vulnerability first disclosed
03 Aug 2024, 20:33
Last Modified
Vulnerability information updated

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

  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • v2.0•HIGH•Score: 7.5AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 47.82%• Percentile: 98%

Techniques & Countermeasures

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

  • CWE-122•Heap-based Buffer Overflow

    A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Affected Systems

  • apache software foundation•apache http server

    2.4.46 | 2.4.43 | 2.4.41 | 2.4.39 | 2.4.38 | 2.4.37 | 2.4.35 | 2.4.34 | 2.4.33 | 2.4.29 | 2.4.28 | 2.4.27 | 2.4.26 | 2.4.25 | 2.4.23 | 2.4.20 | 2.4.18 | 2.4.17 | 2.4.16 | 2.4.12 | 2.4.10 | 2.4.9 | 2.4.7 | 2.4.6 | 2.4.4 | 2.4.3 | 2.4.2 | 2.4.1 | 2.4.0

  • Unknown•HTTP Server

    ≥ 2.4.0, ≤ 2.4.46

  • debian•debian_linux

    9.0 | 10.0

  • fedoraproject•fedora

    34 | 35

  • netapp•cloud_backup

    na

  • oracle•enterprise_manager_ops_center

    12.4.0.0

  • oracle•instantis_enterprisetrack

    17.1 | 17.2 | 17.3

  • oracle•secure_backup

    < 18.1.0.1.0

  • oracle•zfs_storage_appliance_kit

    8.8

References (13)