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
- Cisco 1100-4g\/6g_integrated_services_router
- Cisco 1101_integrated_services_router
- Cisco 1109_integrated_services_router
- Cisco 1111x_integrated_services_router
- Cisco 111x_integrated_services_router
- Cisco 1120_integrated_services_router
- Cisco 1160_integrated_services_router
- Cisco 3000_integrated_services_router
- Cisco 4221_integrated_services_router
- Cisco 4331_integrated_services_router
Weakness classification (CWE)
Public proof-of-concept exploits
References
- psirt@cisco.com (vendor-advisory, Vendor Advisory)
- psirt@cisco.com (mailing-list)
- psirt@cisco.com (vendor-advisory)
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.