CVE-2021-1495 Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerability
Remote attackers can bypass HTTP file policies in Cisco Firepower Threat Defense by sending crafted packets, allowing malicious payload delivery.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-1495?
CVE-2021-1495 is a medium-severity vulnerability in Cisco Ios Xe, published on 29 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Multiple Cisco products are affected by a vulnerability in the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP. The vulnerability is due to incorrect handling of specific HTTP header parameters. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass a configured file policy for HTTP packets and deliver a malicious payload.
Weakness: CWE-755
Which versions are affected by CVE-2021-1495?
It affects 3 products.
Products include Cisco Ios Xe, Cisco Secure Firewall Threat Defense, Snort Snort.
How do I fix CVE-2021-1495?
Apply the vendor's patch.
Is CVE-2021-1495 being exploited?
There is no known exploitation of CVE-2021-1495 in the wild and no public exploit code.
Other vulnerabilities in Cisco Ios Xe
- CVE-2023-20198 Cisco IOS XE Web UI Privilege Escalation
- CVE-2018-0151 Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution
- CVE-2023-20273 Cisco IOS XE Web UI Command Injection
- CVE-2025-20188 Hardcoded credentials in Cisco IOS XE Software
- CVE-2021-34770 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability
Sources
Also known as GHSA-qp86-f9fh-jg8p, UBUNTU-CVE-2021-1495.