--- title: "CVE-2024-23638: SQUID-2023:11 Denial of Service in Cache… | CubePath" description: "Squid is a caching proxy for the Web. Due to an expired pointer reference bug, Squid prior to version 6.6 is vulnerable to a Denial of Service attack…" language: en source: https://cubepath.com/security/cve/CVE-2024-23638 --- # CVE-2024-23638: SQUID-2023:11 Denial of Service in Cache… | CubePath ## Description Squid is a caching proxy for the Web. Due to an expired pointer reference bug, Squid prior to version 6.6 is vulnerable to a Denial of Service attack against Cache Manager error responses. This problem allows a trusted client to perform Denial of Service when generating error pages for Client Manager reports. Squid older than 5.0.5 have not been tested and should be assumed to be vulnerable. All Squid-5.x up to and including 5.9 are vulnerable. All Squid-6.x up to and including 6.5 are vulnerable. This bug is fixed by Squid version 6.6\. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. As a workaround, prevent access to Cache Manager using Squid's main access control: \`http\_access deny manager\`. Official description from the CVE record, published by GitHub\_M. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2024-23638) ## Key data ### CVSS 3.1 Medium 6.5 Score published by GitHub\_M in the CVE record. CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | Metric | Value | What it means | | ---------------------- | --------- | ----------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | Low | A basic user account is needed. | | User interaction | None | No action from any user is needed. | | Scope | Unchanged | The impact stays within the vulnerable component. | | Confidentiality impact | None | No effect on the secrecy of data. | | Integrity impact | None | No effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.60050 (60.1% probability) Percentile 99.1% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA assessment as of Jan 24, 2024 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Public proof of concept recorded by CISA Automatable no Technical impact partial ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-825](https://cwe.mitre.org/data/definitions/825.html) Expired Pointer Dereference ## Affected products Products listed in the CVE record, as the CNA published them. - squid-cache squid - affected: < 6.6 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [github.com/squid-cache/squid/security/advisories/GHSA-j49p-…](https://github.com/squid-cache/squid/security/advisories/GHSA-j49p-553x-48rx) - [github.com/squid-cache/squid/commit/290ae202883ac28a4886707…](https://github.com/squid-cache/squid/commit/290ae202883ac28a48867079c2fb34c40efd382b) - [github.com/squid-cache/squid/commit/e8118a7381213f5cfcdeb4c…](https://github.com/squid-cache/squid/commit/e8118a7381213f5cfcdeb4cec1d2d854bfd261c8) - [megamansec.github.io/Squid-Security-Audit/stream-assert.html](https://megamansec.github.io/Squid-Security-Audit/stream-assert.html) - [squid-cache.org/Versions/v5/SQUID-2023\_11.patch](http://www.squid-cache.org/Versions/v5/SQUID-2023%5F11.patch) - [squid-cache.org/Versions/v6/SQUID-2023\_11.patch](http://www.squid-cache.org/Versions/v6/SQUID-2023%5F11.patch) - [security.netapp.com/advisory/ntap-20240208-0010](https://security.netapp.com/advisory/ntap-20240208-0010/) - [lists.fedoraproject.org/archives/list/package-announce@list…](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7R4KPSO3MQT3KAOZV7LC2GG3CYMCGK7H/) - [lists.fedoraproject.org/archives/list/package-announce@list…](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XWQHRDRHDM5PQTU6BHH4C5KGL37X6TVI/) ## Timeline 1. ID reserved Jan 19, 2024 2. Record published Jan 23, 2024 3. Record last updated Jun 17, 2025 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:05 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)