CVE-2024-37894 | Squid vulnerable to heap corruption in ESI assign

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to an Out-of-bounds Write error when assigning ESI variables, Squid is susceptible to a Memory Corruption error. This error can lead to a Denial of Service attack.

Published: 2024-06-25 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-37894 is rated Moderate Risk (62.6/100): CVSS Medium severity, with high exploitation likelihood (EPSS 6.25%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +4.95% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-37894

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.31% 6.25% +4.95%
2 2025-12-28 1.43% 1.31% -0.12%
3 2025-12-27 — 1.43% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-37894

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 4.0 [email protected]

Weakness enumeration for CVE-2024-37894

OS Trackers for CVE-2024-37894

vendor priority summary link
alpine medium CVE-2024-37894: 1 source package rows (squid); 73 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 0, open 73. https://security.alpinelinux.org/vuln/CVE-2024-37894
debian not yet assigned CVE-2024-37894 not yet assigned priority: Debian including 1 source packages (squid), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-37894
redhat medium — https://access.redhat.com/security/cve/CVE-2024-37894
suse medium — https://www.suse.com/security/cve/CVE-2024-37894/
ubuntu medium CVE-2024-37894 medium priority: Ubuntu including 2 source packages (squid, squid3), 12 status rows across 7 suites (bionic, focal, jammy, mantic, noble, upstream, xenial): released 6, DNE 4, ignored 1, needs-triage 1. https://ubuntu.com/security/CVE-2024-37894

Affected software / configurations for CVE-2024-37894

Vendor Product Version Raw CPE
squid-cache squid >= 3.0, < 6.10 cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*

References for CVE-2024-37894

cvelogic Threat Intelligence