Cyber Resilience

CVE-2021-34699

High

Published: 23 September 2021

Published
23 September 2021
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS Score 0.0070 72.5th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-34699 is a high-severity Improper Interaction Between Multiple Correctly-Behaving Entities (CWE-435) vulnerability in Cisco Ios. Its CVSS base score is 7.7 (High).

Operationally, ranked in the top 27.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

A vulnerability in the TrustSec CLI parser of Cisco IOS and Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload. This vulnerability is due to an improper interaction between the web UI…

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and the CLI parser. An attacker could exploit this vulnerability by requesting a particular CLI command to be run through the web UI. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

CWE(s)
CWE-435CWE-436

Related Threats

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

Affected Assets

cisco
ios
12.2\(6\)i1, 15.0\(1\)sy, 15.0\(1\)sy1, 15.0\(1\)sy10, 15.0\(1\)sy2
cisco
ios xe
16.1.1, 16.1.2, 16.1.3, 16.10.1, 16.10.1a

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References