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Fencer Vulns
medium 5.8

CVE-2023-20071 json

Multiple Cisco products are affected by a vulnerability in the Snort detection engine that could allow an unauthenticated, remote attacker…

published 2023-11-01 3 y ago modified 2026-08-11 2 mo ago also EUVD-2023-24250

cvss
5.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
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 the configured policies on an affected system. This vulnerability is due to a flaw in the FTP module of the Snort detection engine. An attacker could exploit this vulnerability by sending crafted FTP traffic through an affected device. A successful exploit could allow the attacker to bypass FTP inspection and deliver a malicious payload.

Patch / fix

  • cisco secure_firewall_threat_defense 6.4.0.17, 7.0.5, 7.0.6, 7.1.0.3, 7.2.1, 7.2.4, 7.3.1.2
  • cisco cyber_vision 4.1.3
  • cisco unified_threat_defense 17.3.8, 17.6.6, 17.9.4, 17.11.1a, 17.12.1a

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% 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
NVD 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 Umbrella Insights Virtual Appliance
  • Cisco Cisco Cyber Vision
  • Cisco Cisco UTD SNORT IPS Engine Software

Classification

Weakness
  • CWE-1039 Inadequate Detection or Handling of Adversarial Input Perturbations in Automated Recognition Mechanism

References

Sources

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.