Cyber Resilience

CVE-2021-40118

High

Published: 27 October 2021

Published
27 October 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS Score 0.0026 50.0th percentile
Risk Priority 17 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-40118 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Cisco Asa 5512-X Firmware. Its CVSS base score is 8.6 (High).

Operationally, ranked in the top 50.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to…

more

improper input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a malicious HTTPS request to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

CWE(s)
CWE-121CWE-787

Related Threats

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

Affected Assets

cisco
adaptive security appliance
≤ 9.8.4.40
cisco
firepower threat defense
≤ 6.4.0.13 · 6.5.0 — 6.6.5 · 6.7.0 — 6.7.0.3
cisco
adaptive security appliance software
9.9.0 — 9.12.4.29 · 9.13.0 — 9.14.3.9 · 9.15.0 — 9.15.1.17
cisco
asa 5512-x firmware
009.012\(004.024\), 009.015\(001.015\), 009.015\(001.016\), 009.015\(001\), 009.016\(001\)
cisco
asa 5505 firmware
009.012\(004.024\), 009.015\(001.015\), 009.015\(001.016\), 009.015\(001\), 009.016\(001\)
cisco
asa 5515-x firmware
009.012\(004.024\), 009.015\(001.015\), 009.015\(001.016\), 009.015\(001\), 009.016\(001\)
cisco
asa 5525-x firmware
009.012\(004.024\), 009.015\(001.015\), 009.015\(001.016\), 009.015\(001\), 009.016\(001\)
cisco
asa 5545-x firmware
009.012\(004.024\), 009.015\(001.015\), 009.015\(001.016\), 009.015\(001\), 009.016\(001\)
cisco
asa 5555-x firmware
009.012\(004.024\), 009.015\(001.015\), 009.015\(001.016\), 009.015\(001\), 009.016\(001\)
cisco
asa 5580 firmware
009.012\(004.024\), 009.015\(001.015\), 009.015\(001.016\), 009.015\(001\), 009.016\(001\)
+1 more product configuration(s) — see NVD for full list

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