CVE-2021-1494 json
Multiple Cisco products are affected by a vulnerability in the Snort detection engine that could allow an unauthenticated, remote attacker…
published 2024-11-15 23 mo ago modified 2026-06-17 4 mo ago also EUVD-2021-6961
- cvss
- 5.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 65%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- cisco firepower_threat_defense_software 6.4.0.12, 6.6.4, 6.7.0.2
- cisco utd_snort_ips_engine_software 16.12.5, 17.3.3, 17.4.1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 23 mo ago
Exploit prediction
1.10% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
Affected products
- Cisco Cisco Firepower Threat Defense Software
- Cisco Cisco UTD SNORT IPS Engine Software
- cisco firepower_threat_defense_software
- cisco utd_snort_ips_engine_software
Classification
- Weakness
-
- CWE-693 Protection Mechanism Failure
References
Sources
- CVE List CVE-2021-1494
- NVD CVE-2021-1494
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.