CVE-2020-25613

HIGH
7.5
CVSS Score
Published: October 6, 2020 at 12:00 AM UTC
Updated: June 17, 2026 at 03:06 AM UTC
3 products affected across 2 vendorsFedoraRubyWEBrick

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Severity
HIGH7.5
Exploit prediction
EPSS 4%

Description

An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.

Affected

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

95%
v ≤ 2.5.82.6.0 ≤ v ≤ 2.6.62.7.0 ≤ v ≤ 2.7.1
v ≤ 1.6.0

CVSS

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

Quick Info

StatusMODIFIED
CWE
CWE-444

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