squid: incorrect server error handling resulting in denial of service
Published Apr 19, 2016
5.9
MEDIUMCVSS 3.0
EPSS 25.55%
Description
The FwdState::connectedToPeer method in FwdState.cc in Squid before 3.5.14 and 4.0.x before 4.0.6 does not properly handle SSL handshake errors when built with the --with-openssl option, which allows remote attackers to cause a denial of service (application crash) via a plaintext HTTP message.
Affected products
No data.
- ≤ 3.5.13
- 4.0.4
- 4.0.5
No data.
Red Hat Enterprise Linux 5
squid
Not affected
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 | Not affected | 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 versions 5, 6 and 7, as they are not shipped with a vulnerable version of squid, and no currently backported patch would introduce the bug.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:M/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 (31 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 25.55% (0.25550) | 97.90th | v5 (v2026.06.15) |
| Sep 22, 2026 | 25.55% (0.25550) | 97.86th | v5 (v2026.06.15) |
| Sep 21, 2026 | 35.45% (0.35455) | 98.42th | v5 (v2026.06.15) |
| Sep 6, 2026 | 25.55% (0.25550) | 97.81th | v5 (v2026.06.15) |
| Sep 5, 2026 | 35.45% (0.35455) | 98.39th | v5 (v2026.06.15) |
| Aug 30, 2026 | 25.55% (0.25550) | 97.80th | v5 (v2026.06.15) |
| Aug 28, 2026 | 35.45% (0.35455) | 98.38th | v5 (v2026.06.15) |
| Aug 24, 2026 | 25.55% (0.25550) | 97.79th | v5 (v2026.06.15) |
| Aug 23, 2026 | 35.45% (0.35455) | 98.37th | v5 (v2026.06.15) |
| Jun 15, 2026 | 25.55% (0.25550) | 97.68th | v5 (v2026.06.15) |
| Dec 28, 2025 | 21.28% (0.21283) | 95.49th | v4 (v2025.03.14) |
| Dec 27, 2025 | 35.49% (0.35492) | 96.93th | v4 (v2025.03.14) |
| Oct 28, 2025 | 21.28% (0.21283) | 95.43th | v4 (v2025.03.14) |
| Oct 27, 2025 | 35.49% (0.35492) | 96.88th | v4 (v2025.03.14) |
| Oct 1, 2025 | 21.28% (0.21283) | 95.52th | v4 (v2025.03.14) |
| Jul 30, 2025 | 35.49% (0.35492) | 96.91th | v4 (v2025.03.14) |
| Jul 9, 2025 | 21.28% (0.21283) | 95.40th | v4 (v2025.03.14) |
| Mar 30, 2025 | 37.03% (0.37026) | 96.84th | v4 (v2025.03.14) |
| Mar 29, 2025 | 48.47% (0.48468) | 96.71th | v4 (v2025.03.14) |
| Mar 17, 2025 | 37.03% (0.37026) | 96.80th | v4 (v2025.03.14) |
| Dec 17, 2024 | 65.58% (0.65576) | 98.06th | v3 (v2023.03.01) |
| Apr 14, 2024 | 71.69% (0.71689) | 98.02th | v3 (v2023.03.01) |
| Jan 8, 2024 | 65.58% (0.65576) | 97.61th | v3 (v2023.03.01) |
| Sep 30, 2023 | 58.65% (0.58650) | 97.32th | v3 (v2023.03.01) |
| Aug 27, 2023 | 51.14% (0.51138) | 97.10th | v3 (v2023.03.01) |
| Jul 21, 2023 | 22.48% (0.22477) | 95.88th | v3 (v2023.03.01) |
| Mar 7, 2023 | 6.98% (0.06982) | 92.85th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
References (11)
- http://bugs.squid-cache.org/show_bug.cgi?id=4437 x_refsource_CONFIRM
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html vendor-advisoryx_refsource_SUSE
- http://lists.squid-cache.org/pipermail/squid-announce/2016-February/000037.html mailing-listx_refsource_MLISTVendor Advisory
- http://lists.squid-cache.org/pipermail/squid-announce/2016-February/000038.html mailing-listx_refsource_MLISTVendor Advisory
- http://www.securitytracker.com/id/1035045 vdb-entryx_refsource_SECTRACK
- http://www.squid-cache.org/Advisories/SQUID-2016_1.txt x_refsource_CONFIRMVendor Advisory
- https://access.redhat.com/security/cve/CVE-2016-2390 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1308865 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2016-2390
- https://www.cve.org/CVERecord?id=CVE-2016-2390
| Link | Providers | Tags |
|---|---|---|
| http://bugs.squid-cache.org/show_bug.cgi?id=4437 | x_refsource_CONFIRM | |
| http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html | vendor-advisoryx_refsource_SUSE | |
| http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html | vendor-advisoryx_refsource_SUSE | |
| http://lists.squid-cache.org/pipermail/squid-announce/2016-February/000037.html | mailing-listx_refsource_MLISTVendor Advisory | |
| http://lists.squid-cache.org/pipermail/squid-announce/2016-February/000038.html | mailing-listx_refsource_MLISTVendor Advisory | |
| http://www.securitytracker.com/id/1035045 | vdb-entryx_refsource_SECTRACK | |
| http://www.squid-cache.org/Advisories/SQUID-2016_1.txt | x_refsource_CONFIRMVendor Advisory | |
| https://access.redhat.com/security/cve/CVE-2016-2390 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1308865 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-2390 | ||
| https://www.cve.org/CVERecord?id=CVE-2016-2390 |
Change history (0)
No recorded changes yet.