How severe is CVE-2026-20058?

CVE-2026-20058 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-2026-20058 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20058?

CVE-2026-20058 primarily affects Cisco Snort. In total, 68 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20058?

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

Does CVE-2026-20058 have an EU (EUVD) identifier?

Yes. CVE-2026-20058 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9462.

When was CVE-2026-20058 published?

CVE-2026-20058 was published on 2026-03-04 and last updated on 2026-08-20.

CVE-2026-20058

CVE-2026-20058 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-786.

Key facts

Severity: Medium (CVSS 3.x base score 5.8)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9462
Weakness: CWE-786
Affected product: Cisco Snort
Published: 2026-03-04
Last modified: 2026-08-20

Description

Multiple Cisco products are affected by vulnerabilities in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. These vulnerabilities are due to improper error checking when decompressing VBA data. An attacker could exploit these vulnerabilities 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 unexpectedly restart, causing a DoS condition.

Frequently asked questions

What is CVE-2026-20058?: Multiple Cisco products are affected by vulnerabilities in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. These vulnerabilities are due to improper error checking when decompressing VBA data. An attacker could exploit these vulnerabilities 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 unexpectedly restart, causing a DoS condition.
How severe is CVE-2026-20058?: CVE-2026-20058 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-2026-20058 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20058?: CVE-2026-20058 primarily affects Cisco Snort. In total, 68 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20058?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-20058 have an EU (EUVD) identifier?: Yes. CVE-2026-20058 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9462.
When was CVE-2026-20058 published?: CVE-2026-20058 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 (68)

cpe:2.3:a:cisco:snort:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.6:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.7:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.9:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.10:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.10.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.2.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.7.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.7.10:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.7.10.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.9.3a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.9.5a:*:*:*:*:*:*:*

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