Path traversal in Cisco Systems, Inc products - CVE-2021-1436

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Main Vulnerability Database Vulnerabilities #VU51782

Path traversal in Cisco Systems, Inc products - CVE-2021-1436

Published: March 30, 2021


Vulnerability identifier: #VU51782
CSH Severity: Low
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-1436
CWE-ID: CWE-22
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in the CLI. A local administrator can send a specially crafted HTTP request and view arbitrary files on the system.


Affected software

Cisco 1000 Series Integrated Services Routers
4000 Series Integrated Services Routers
Cisco ASR 1000 Series Aggregation Services Routers
Cloud Services Router 1000V Series
Cisco IOS XE SD-WAN

How to mitigate CVE-2021-1436

Install update from vendor's website.

Cisco IOS XE SD-WAN - addressed in versions 16.12.4.39, 16.12.5, 16.12.5a, 17.1.3, 17.3.0.211, 17.3.1, 17.3.1w, 17.3.1x, 17.3.1a, 17.3.1.9, 17.3.2, 17.3.2a, 17.3.3, 17.3.3a, 17.4.0.62, 17.4.1, 17.4.1a, 17.4.1 b

External References

Related Security Bulletins