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Vulnerabilities

Vulnerability · CVE-2026-20057

Multiple Cisco products are affected by a vulnerability in the Snort 3 Visual Basic for Applications (VBA) feature which could allow an unauthenticated, remote attacke…

Published Mar 4, 2026 · catalog updated Aug 20, 2026 · the affected product

Last checked Oct 30, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-20057. EPSS is 0.49%. 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.

Same product and reporting

Severity
Medium5.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.49%
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 Visual Basic for Applications (VBA) feature which could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to lack of proper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending a crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to unexpectedly restart causing a a denial of service (DoS) condition.

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 defense7.2.0
  • cpe cisco/snortversion unspecified
  • cpe cisco/unified threat defense snort intrusion prevention system engine17.12.1a

How to fix CVE-2026-20057

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-2026-20057. EPSS is 0.49%. 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-369. EPSS 0.49%. 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 Visual Basic for Applications (VBA) feature which could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to lack of proper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending a crafted VBA data to the Snort 3 Detec

  2. Aug 20, 2026 · NIST NVD

    Updated

    Multiple Cisco products are affected by a vulnerability in the Snort 3 Visual Basic for Applications (VBA) feature which could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to lack of proper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending a crafted VBA data to the Snort 3 Detec

Sources

  • CVE.orgVulnerability recordCVE-2026-20057

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20057

    30-day exploitation probability 0.49%

    first.org
  • NIST NVDVulnerability recordCVE-2026-20057

    Multiple Cisco products are affected by a vulnerability in the Snort 3 Visual Basic for Applications (VBA) feature which could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to lack of proper erro

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 30, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 30, 2026
  • CVE.orgOct 16, 2026
  • NIST NVDOct 15, 2026