squid: CRLF injection flaw permitting HTTP response splitting attacks
Published Feb 20, 2015
4.3
MEDIUMCVSS 2.0
EPSS 4.51%
Description
CRLF injection vulnerability in Squid before 3.1.1 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a crafted header in a response.
Affected products
No data.
- ≤ 3.1.0.18
No data.
Red Hat Enterprise Linux 5
squid
Will not fix
Red Hat Enterprise Linux 6
squid
Not affected
Red Hat Enterprise Linux 7
squid
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | squid | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | squid | Not affected | n/a |
| Red Hat Enterprise Linux 7 | squid | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of squid as shipped with Red Hat Enterprise Linux 6 and 7. Red Hat Enterprise Linux 6 ships version 3.1.10 and Red Hat Enterprise Linux 7 ships version 3.3.8 of squide, both of which include the fix for this issue. Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
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:M/Au:N/C:N/I:P/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 (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.51% (0.04507) | 91.21th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.51% (0.04507) | 90.26th | v5 (v2026.06.15) |
| Aug 20, 2025 | 4.38% (0.04383) | 88.53th | v4 (v2025.03.14) |
| Mar 30, 2025 | 1.81% (0.01809) | 81.20th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.42% (0.06420) | 84.63th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.81% (0.01809) | 81.61th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.25% (0.00248) | 65.31th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.25% (0.00248) | 63.81th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.25% (0.00248) | 60.86th | 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://jvn.jp/en/jp/JVN64455813/index.html third-party-advisoryx_refsource_JVNVendor Advisory
- http://jvndb.jvn.jp/jvndb/JVNDB-2015-000019 third-party-advisoryx_refsource_JVNDBVendor Advisory
- https://access.redhat.com/security/cve/CVE-2015-0881 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1199518 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-0881
- https://www.cve.org/CVERecord?id=CVE-2015-0881
| Link | Providers | Tags |
|---|---|---|
| http://jvn.jp/en/jp/JVN64455813/index.html | third-party-advisoryx_refsource_JVNVendor Advisory | |
| http://jvndb.jvn.jp/jvndb/JVNDB-2015-000019 | third-party-advisoryx_refsource_JVNDBVendor Advisory | |
| https://access.redhat.com/security/cve/CVE-2015-0881 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1199518 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-0881 | ||
| https://www.cve.org/CVERecord?id=CVE-2015-0881 |
Change history (0)
No recorded changes yet.