Vulnerability in Cisco 1100-4g\/6g Integrated Services Router

CVE-2021-1495

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.

EPSS: 0.017 (75.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-1495?
CVE-2021-1495 is a medium-severity vulnerability in Cisco 1100-4g\/6g Integrated Services Router, classified under Improper Handling of Exceptional Conditions. CVSS score: 5.8/10. Published 2021-04-29.
How severe is CVE-2021-1495?
Medium severity. CVSS v3 base score is 5.8 out of 10.
Is CVE-2021-1495 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.