CVE-2021-1495
MediumCVSS 5.8Exploitation Probability (EPSS)
High risk75th percentile - higher than 75% of all known CVEs
Summary
A vulnerability in the Snort detection engine of multiple Cisco products could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP. The issue is due to incorrect handling of specific HTTP header parameters. An attacker could exploit this by sending crafted HTTP packets through an affected device, bypassing the policy and delivering a malicious payload.
Risk Assessment
The risk is that malicious software could be delivered into the network despite configured security policies, potentially leading to system compromise.
Recommendation
It is recommended to upgrade Cisco software to a patched version for Snort and review file policy configurations.
Original NVD description (English source)
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.