CVE-2023-20267Network attack vector

IP restriction bypass via ignored geolocation entry

Published Nov 1, 2023 · Updated Nov 21, 2024

Improper access control in Snort 3 rules in Cisco Firepower Threat Defense 6.7.0 through 7.3.1.1 allows remote attackers to bypass IP restrictions. The geolocation configuration parser ignores the last IP exclusion entry, causing ACL decisions to omit that configured range. Exploitation requires Snort 3 with a geolocation inspection policy and a spoofed source address, exposing assets otherwise protected by the ACL.

CVSS severity4.0
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Snort 3 rules in Cisco Firepower Threat Defense 6.7.0 through 7.3.1.1 allows remote attackers to bypass IP restrictions. The geolocation configuration parser ignores the last IP exclusion entry, causing ACL decisions to omit that configured range. Exploitation requires Snort 3 with a geolocation inspection policy and a spoofed source address, exposing assets otherwise protected by the ACL.

The record

CVE
CVE-2023-20267
Published
Nov 1, 2023
Updated
Nov 21, 2024
Vendor
ClamAV
Product
Cisco Firepower Threat Defense
Classifications
CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 21, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.7.0
  2. Affected versionversion=6.7.0.1
  3. Affected versionversion=6.7.0.2
  4. Affected versionversion=6.7.0.3
  5. Affected versionversion=7.0.0
  6. Affected versionversion=7.0.0.1
  7. Affected versionversion=7.0.1
  8. Affected versionversion=7.0.1.1
  9. Affected versionversion=7.0.2
  10. Affected versionversion=7.0.2.1
  11. Affected versionversion=7.0.3
  12. Affected versionversion=7.0.4
  13. Affected versionversion=7.0.5
  14. Affected versionversion=7.1.0
  15. Affected versionversion=7.1.0.1
  16. Affected versionversion=7.1.0.2
  17. Affected versionversion=7.1.0.3
  18. Affected versionversion=7.2.0
  19. Affected versionversion=7.2.0.1
  20. Affected versionversion=7.2.1
  21. Affected versionversion=7.2.2
  22. Affected versionversion=7.2.3
  23. Affected versionversion=7.3.0
  24. Affected versionversion=7.3.1
  25. Affected versionversion=7.3.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Firepower Threat Defenseversion=6.7.0; version=6.7.0.1; version=6.7.0.2; version=6.7.0.3; version=7.0.0; version=7.0.0.1; version=7.0.1; version=7.0.1.1; version=7.0.2; version=7.0.2.1; version=7.0.3; version=7.0.4; version=7.0.5; version=7.1.0; version=7.1.0.1; version=7.1.0.2; version=7.1.0.3; version=7.2.0; version=7.2.0.1; version=7.2.1; version=7.2.2; version=7.2.3; version=7.3.0; version=7.3.1; version=7.3.1.1

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
4.0Cisco Systems, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1190Exploit Public-Facing Application

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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