Cyber Resilience

CVE-2021-26691

Critical

Published: 10 June 2021

Published
10 June 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.3627 97.2th percentile
Risk Priority 41 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-26691 is a critical-severity Heap-based Buffer Overflow (CWE-122) vulnerability in Oracle Instantis Enterprisetrack. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 2.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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

CWE(s)
CWE-122CWE-787

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

apache
http server
2.4.0 — 2.4.46
debian
debian linux
10.0, 9.0
fedoraproject
fedora
34, 35
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
netapp
cloud backup
all versions

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-787

Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.

References