CVE-2021-31807

MEDIUM
6.5
CVSS Score
Published: June 8, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 03:52 AM UTC
3 products affected across 3 vendorsFedoraCache SquidCloud Manager

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Severity
MEDIUM6.5
Exploit prediction
EPSS 16%

Description

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. An integer overflow problem allows a remote server to achieve Denial of Service when delivering responses to HTTP Range requests. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent.

Affected

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

All versions
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
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-190

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