CVE-2021-28652

MEDIUM
4.9
CVSS Score
Published: May 27, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 03:46 AM UTC
3 products affected across 3 vendorsDebian LinuxFedoraCache Squid

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Severity
MEDIUM4.9
Exploit prediction
EPSS 4%

Description

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This attack is limited to clients with Cache Manager API access privilege.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

1.0 ≤ v < 4.155.0 ≤ v < 5.0.6
Affected range stops below 4.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.0.6, so it looks safe — our inference, not a vendor statement

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-401

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