What’s Vulnerable › Vulnerabilities

CVE-2021-1240: Cisco Proximity Desktop for Windows DLL Hijacking Vulnerability

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-13 · updated 2026-06-17
• Weakness: CWE-427

Description

A vulnerability in the loading process of specific DLLs in Cisco Proximity Desktop for Windows could allow an authenticated, local attacker to load a malicious library. To exploit this vulnerability, the attacker must have valid credentials on the Windows system. This vulnerability is due to incorrect handling of directory paths at run time. An attacker could exploit this vulnerability by placing a malicious DLL file in a specific location on the targeted system. This file will execute when the vulnerable application launches. A successful exploit could allow the attacker to execute arbitrary code on the targeted system with the privileges of another user’s account.

Affected products

• Cisco Proximity: before 3.1.0 — fixed in 3.1.0

How to fix

Upgrade to a fixed version: Cisco Proximity 3.1.0. Check the vendor advisory for mitigations.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-proximity-dll-UvW4VHPM
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-proximity-dll-UvW4VHPM

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