CVE-2018-1000024
The Squid Software Foundation Squid HTTP Caching Proxy version 3.0 to 3.5.27, 4.0 to 4.0.22 contains a Incorrect Pointer Handling vulnerability in ESI Response Processing that can result in Denial of Service for all clients using the proxy..
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (7.93%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The Squid Software Foundation Squid HTTP Caching Proxy version 3.0 to 3.5.27, 4.0 to 4.0.22 contains a Incorrect Pointer Handling vulnerability in ESI Response Processing that can result in Denial of Service for all clients using the proxy.. This attack appear to be exploitable via Remote server delivers an HTTP response payload containing valid but unusual ESI syntax.. This vulnerability appears to have been fixed in 4.0.23 and later.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 7.93% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- squid-cache/squid · debian/debian linux · canonical/ubuntu linux
- Source
- cve@mitre.org
EPSS 7.9% since 28 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.squid-cache.org/Advisories/SQUID-2018_1.txtPatch, Vendor Advisory
- http://www.squid-cache.org/Versions/Release Notes, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00001.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/3557-1/Third Party Advisory
- https://usn.ubuntu.com/4059-2/
- https://www.debian.org/security/2018/dsa-4122Third Party Advisory
- http://www.squid-cache.org/Advisories/SQUID-2018_1.txtPatch, Vendor Advisory
- http://www.squid-cache.org/Versions/Release Notes, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00001.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/3557-1/Third Party Advisory
- https://usn.ubuntu.com/4059-2/
- https://www.debian.org/security/2018/dsa-4122Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.