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
Published 2021-06-10 07:15:08
Updated 2022-03-25 18:32:42
View at NVD,   CVE.org
Vulnerability category: OverflowMemory Corruption

Threat overview for CVE-2021-26691

Top countries where our scanners detected CVE-2021-26691
Top open port discovered on systems with this issue 80
IPs affected by CVE-2021-26691 7,544,298
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2021-26691!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-26691

Probability of exploitation activity in the next 30 days: 68.94%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 98 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-26691

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
7.5
HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P
10.0
6.4
NIST
9.8
CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
NIST

CWE ids for CVE-2021-26691

  • 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().
    Assigned by: security@apache.org (Secondary)
  • The product writes data past the end, or before the beginning, of the intended buffer.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-26691

Products affected by CVE-2021-26691

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