CVE-2020-9363Network attack vector

Malware-filter bypass via conflicting ZIP interpretation

Published Feb 24, 2020 · Updated Aug 4, 2024

Interpretation conflict in the AV engine of Sophos UTM through 9.7 allows remote attackers to bypass malware filtering via a crafted ZIP archive. The engine treats a corrupted ZIP as unscannable even though third-party unpacking tools can still extract its malicious contents. The bypass requires SG UTM's former default handling of unscannable archives and unprotected downstream endpoints, allowing hidden malware to cross the gateway and execute after extraction.

CVSS severity7.8
High
EPSS probability0.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Interpretation conflict in the AV engine of Sophos UTM through 9.7 allows remote attackers to bypass malware filtering via a crafted ZIP archive. The engine treats a corrupted ZIP as unscannable even though third-party unpacking tools can still extract its malicious contents. The bypass requires SG UTM's former default handling of unscannable archives and unprotected downstream endpoints, allowing hidden malware to cross the gateway and execute after extraction.

The record

CVE
CVE-2020-9363
Published
Feb 24, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-436, T1027
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-436Interpretation Conflict
T1027Obfuscated Files or Information

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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