The aclMatchExternal function in Squid before 2.6.STABLE7 allows remote attackers to cause a denial of service (crash) by causing an external_acl queue overload, which triggers an infinite loop
Published Jan 16, 2007
5.0
MEDIUMCVSS 2.0
EPSS 6.90%
Description
The aclMatchExternal function in Squid before 2.6.STABLE7 allows remote attackers to cause a denial of service (crash) by causing an external_acl queue overload, which triggers an infinite loop.
Affected products
Remediation
Red Hat statement
Red Hat Enterprise Linux 5 is not vulnerable to this issue as it contains a backported patch. This issue did not affect the versions of Squid as shipped with Red Hat Enterprise Linux 2.1, 3, or 4.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (18 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 6.90% (0.06897) | 93.88th | v5 (v2026.06.15) |
| Jun 15, 2026 | 6.69% (0.06686) | 93.03th | v5 (v2026.06.15) |
| Feb 9, 2026 | 52.63% (0.52625) | 97.86th | v4 (v2025.03.14) |
| Apr 2, 2025 | 46.12% (0.46117) | 97.39th | v4 (v2025.03.14) |
| Mar 30, 2025 | 43.54% (0.43540) | 97.24th | v4 (v2025.03.14) |
| Mar 29, 2025 | 38.90% (0.38903) | 95.88th | v4 (v2025.03.14) |
| Mar 17, 2025 | 43.54% (0.43540) | 97.21th | v4 (v2025.03.14) |
| Dec 17, 2024 | 67.81% (0.67811) | 98.13th | v3 (v2023.03.01) |
| Mar 13, 2024 | 31.96% (0.31965) | 96.88th | v3 (v2023.03.01) |
| Dec 28, 2023 | 27.57% (0.27567) | 96.36th | v3 (v2023.03.01) |
| Nov 20, 2023 | 22.63% (0.22625) | 96.03th | v3 (v2023.03.01) |
| Oct 13, 2023 | 14.63% (0.14627) | 95.13th | v3 (v2023.03.01) |
| Sep 5, 2023 | 15.32% (0.15319) | 95.16th | v3 (v2023.03.01) |
| Jun 20, 2023 | 14.87% (0.14867) | 95.01th | v3 (v2023.03.01) |
| Mar 7, 2023 | 18.72% (0.18719) | 95.37th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.78% (0.03779) | 85.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.78% (0.03779) | 84.01th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.78% (0.03779) | 67.21th | v2 (v2022.01.01) |
No CWE recorded.
References (17)
- http://secunia.com/advisories/23767 third-party-advisoryx_refsource_SECUNIAPatchVendor Advisory
- http://secunia.com/advisories/23805 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/23889 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/23921 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/23946 third-party-advisoryx_refsource_SECUNIA
- http://www.gentoo.org/security/en/glsa/glsa-200701-22.xml vendor-advisoryx_refsource_GENTOO
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:026 vendor-advisoryx_refsource_MANDRIVA
- http://www.novell.com/linux/security/advisories/2007_12_squid.html vendor-advisoryx_refsource_SUSE
- http://www.securityfocus.com/bid/22203 vdb-entryx_refsource_BID
- http://www.squid-cache.org/Versions/v2/2.6/squid-2.6.STABLE7-RELEASENOTES.html#s12 x_refsource_CONFIRM
- http://www.squid-cache.org/bugs/show_bug.cgi?id=1848 x_refsource_CONFIRM
- http://www.ubuntu.com/usn/usn-414-1 vendor-advisoryx_refsource_UBUNTU
- http://www.vupen.com/english/advisories/2007/0199 vdb-entryx_refsource_VUPEN
- https://access.redhat.com/security/cve/CVE-2007-0248 Vendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/31525 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2007-0248
- https://www.cve.org/CVERecord?id=CVE-2007-0248
Change history (0)
No recorded changes yet.