squid: remote bypass of access controls
Published Mar 4, 2009
5.4
MEDIUMCVSS 2.0
EPSS 3.09%
Description
Squid, when transparent interception mode is enabled, uses the HTTP Host header to determine the remote endpoint, which allows remote attackers to bypass access controls for Flash, Java, Silverlight, and probably other technologies, and possibly communicate with restricted intranet sites, via a crafted web page that causes a client to send HTTP requests with a modified Host header.
Affected products
No data.
- 2.7
- 2.7.stable5
- 2.7.stable6
- 3.0
- 3.0_pre1
- 3.0_pre2
- 3.0_pre3
- 3.0_stable1
- 3.0_stable2
- 3.0_stable3
- 3.0_stable4
- 3.0_stable5
- 3.0_stable6
- 3.0_stable7
- 3.0_stable12
- 3.0_stable13
No data.
Red Hat Enterprise Linux 4
squid
Will not fix
Red Hat Enterprise Linux 5
squid
Will not fix
Red Hat Enterprise Linux 6
squid
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | squid | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | squid | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | squid | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
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:H/Au:N/C:C/I:N/A:N
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 (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.09% (0.03089) | 87.26th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.09% (0.03089) | 85.96th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.04% (0.00039) | 8.66th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.18% (0.00182) | 56.76th | v3 (v2023.03.01) |
| Apr 25, 2024 | 0.17% (0.00172) | 53.75th | v3 (v2023.03.01) |
| Mar 15, 2024 | 0.16% (0.00159) | 51.34th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.15% (0.00151) | 50.06th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.18% (0.00182) | 53.62th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
References (6)
- http://www.kb.cert.org/vuls/id/435052 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
- http://www.securityfocus.com/bid/33858 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2009-0801 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=488502 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2009-0801
- https://www.cve.org/CVERecord?id=CVE-2009-0801
| Link | Providers | Tags |
|---|---|---|
| http://www.kb.cert.org/vuls/id/435052 | third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource | |
| http://www.securityfocus.com/bid/33858 | vdb-entryx_refsource_BID | |
| https://access.redhat.com/security/cve/CVE-2009-0801 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=488502 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2009-0801 | ||
| https://www.cve.org/CVERecord?id=CVE-2009-0801 |
Change history (0)
No recorded changes yet.