How severe is CVE-2026-20054?

CVE-2026-20054 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-20054 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20054?

CVE-2026-20054 primarily affects Cisco Snort. In total, 194 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20054?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-20054 have an EU (EUVD) identifier?

Yes. CVE-2026-20054 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9460.

When was CVE-2026-20054 published?

CVE-2026-20054 was published on 2026-03-04 and last updated on 2026-08-20.

CVE-2026-20054

CVE-2026-20054 is a medium-severity vulnerability in Cisco Snort with a CVSS 3.x base score of 5.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-835.

Key facts

Severity: Medium (CVSS 3.x base score 5.8)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9460
Weakness: CWE-835
Affected product: Cisco Snort
Published: 2026-03-04
Last modified: 2026-08-20

Description

Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash.  This vulnerability is due to improper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending 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 enter an infinite loop, causing a DoS condition.

Frequently asked questions

What is CVE-2026-20054?: Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash.  This vulnerability is due to improper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending 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 enter an infinite loop, causing a DoS condition.
How severe is CVE-2026-20054?: CVE-2026-20054 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-20054 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20054?: CVE-2026-20054 primarily affects Cisco Snort. In total, 194 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20054?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-20054 have an EU (EUVD) identifier?: Yes. CVE-2026-20054 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9460.
When was CVE-2026-20054 published?: CVE-2026-20054 was published on 2026-03-04 and last updated on 2026-08-20.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed

Affected products (194)

cpe:2.3:a:cisco:snort:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.0.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.0.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.0.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.0.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.0.5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.0.6:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.1.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.2.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.2.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.2.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.2.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:3.2.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.0.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.0.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.0.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.0.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.1.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.1.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.1.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.1.5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.1.6:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.1.7:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.2.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.2.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.2.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.2.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.2.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.2.6:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.3.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.3.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.3.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.3.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.4.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cyber_vision:4.4.1:*:*:*:*:*:*:*

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