Remote service restart via VBA decompression error
Published Mar 4, 2026 · Updated Mar 4, 2026
Improper error checking in Cisco Snort 3 VBA decompression allows remote attackers to restart the Detection Engine with crafted VBA data. The VBA Decompression Engine fails to handle an error condition while processing attacker-controlled compressed macro data, causing Snort 3 to restart unexpectedly. Exploitation requires Snort 3 with VBA macro decompression enabled; the feature is disabled by default, and impact is limited to service interruption.
Summary
What happened
Improper error checking in Cisco Snort 3 VBA decompression allows remote attackers to restart the Detection Engine with crafted VBA data. The VBA Decompression Engine fails to handle an error condition while processing attacker-controlled compressed macro data, causing Snort 3 to restart unexpectedly. Exploitation requires Snort 3 with VBA macro decompression enabled; the feature is disabled by default, and impact is limited to service interruption.
The record
- CVE
- CVE-2026-20058
- Published
- Mar 4, 2026
- Updated
- Mar 4, 2026
- Vendor
- ClamAV
- Product
- Cisco UTD Snort IPS Engine Software
- Classifications
- CWE-786, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 4, 2026CVE publishedPublication date reported by the CVE source.
- Mar 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=17.12.1a
- Affected versionversion=17.12.2
- Affected versionversion=17.12.3
- Affected versionversion=17.12.3a
- Affected versionversion=17.12.4
- Affected versionversion=17.12.4a
- Affected versionversion=17.12.4b
- Affected versionversion=17.12.5
- Affected versionversion=17.12.5a
- Affected versionversion=17.12.5b
- Affected versionversion=17.12.5c
- Affected versionversion=17.12.5d
- Affected versionversion=17.12.6
- Affected versionversion=17.13.1a
- Affected versionversion=17.14.1a
- Affected versionversion=17.15.1a
- Affected versionversion=17.15.2a
- Affected versionversion=17.15.2c
- Affected versionversion=17.15.3
- Affected versionversion=17.15.3a
- Affected versionversion=17.15.4
- Affected versionversion=17.15.4c
- Affected versionversion=17.16.1a
- Affected versionversion=17.17.1
- Affected versionversion=17.18.1
- Affected versionversion=17.18.1a
- Affected versionversion=17.18.2
- Affected versionversion=17.9.3a
- Affected versionversion=17.9.5a
- Affected versionversion=17.9.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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