Cyber Resilience

CVE-2021-28651

HighPublic PoC

Published: 27 May 2021

Published
27 May 2021
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0613 91.0th percentile
Risk Priority 19 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-28651 is a high-severity Missing Release of Memory after Effective Lifetime (CWE-401) vulnerability in Squid-Cache Squid. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 9.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount of memory. However,…

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there is an unspecified attack methodology that can easily trigger a large amount of memory consumption.

CWE(s)
CWE-401

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

squid-cache
squid
2.0 — 4.15 · 5.0 — 5.0.6
debian
debian linux
10.0, 9.0
fedoraproject
fedora
33, 34
netapp
cloud manager
all versions

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References