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Vulnerabilities

Vulnerability · CVE-2026-20067

Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detec…

Published Mar 4, 2026 · catalog updated Aug 19, 2026 · the affected product

Check if you run it

No confirmed exploitation is on record for CVE-2026-20067. EPSS is 0.47%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.47%
Remediation
Advisory link
Affected products
cpe cisco/cyber vision · cpe cisco/secure firewall threat defense · cpe cisco/snort · cpe cisco/unified threat defense snort intrusion prevention system engine

Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when parsing the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cisco/cyber vision3.0.0
  • cpe cisco/cyber vision3.0.1
  • cpe cisco/cyber vision3.0.2
  • cpe cisco/cyber vision3.0.3
  • cpe cisco/cyber vision3.0.4
  • cpe cisco/cyber vision3.0.5
  • cpe cisco/cyber vision3.0.6
  • cpe cisco/secure firewall threat defense7.0.0
  • cpe cisco/snortversion unspecified
  • cpe cisco/unified threat defense snort intrusion prevention system engine17.2.1r

How to fix CVE-2026-20067

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20067. EPSS is 0.47%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with cisco/cyber vision 3.0.0; cisco/cyber vision 3.0.1; cisco/cyber vision 3.0.2; cisco/cyber vision 3.0.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 0.47%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 4, 2026 · NIST NVD

    Detected

    Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when parsing the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability

  2. Aug 19, 2026 · NIST NVD

    Updated

    Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when parsing the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability

Sources

  • CVE.orgVulnerability recordCVE-2026-20067

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20067

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-20067

    Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.