CVE-2018-1000027
The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can
02 Description
The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 12.91% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 96.1% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2018-02-09 23:00Z8 YR AGO
- Last updated
- 2024-08-05 12:33Z2 YR AGO
- Reserved
- 2018-01-29
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- Data version
- 5.1
- Document digest
- b46b86edb6a0e8f868ad05edf4ceedc34a232455e00e647aed2b2a2b062a29c7
05 Affected products
06 References
- usn.ubuntu.comUSN-3557-1https://usn.ubuntu.com/3557-1/
- www.squid-cache.orghttp://www.squid-cache.org/Versions/v4/changesets/SQUID-2018_2.patch
- www.debian.orgDSA-4122https://www.debian.org/security/2018/dsa-4122
- www.squid-cache.orghttp://www.squid-cache.org/Advisories/SQUID-2018_2.txt
- lists.debian.org[debian-lts-announce] 20180202 [SECURITY] [DLA 1266-1] squid3 security updatehttps://lists.debian.org/debian-lts-announce/2018/02/msg00001.html
- github.comhttps://github.com/squid-cache/squid/pull/129/files
- www.squid-cache.orghttp://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_2.patch
- lists.debian.org[debian-lts-announce] 20180202 [SECURITY] [DLA 1267-1] squid security updatehttps://lists.debian.org/debian-lts-announce/2018/02/msg00002.html
- usn.ubuntu.comUSN-4059-2https://usn.ubuntu.com/4059-2/
07 Fixed in
Debian 12
- squid Fixed in 4.1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- squid Fixed in 4.1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- squid Fixed in 4.1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- squid3 Fixed in 3.3.8-1ubuntu6.11
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- squid3 Fixed in 3.5.12-1ubuntu7.5
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- squid3 Fixed in 3.5.23-5ubuntu2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.