cve.bz

CVE-2020-25613

7.5 highEPSS 3.8%

High (7.5). EPSS 3.8% chance of exploitation in the next 30 days. Fixed in webrick 1.4.4, 1.5.1, 1.6.1.

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.

Severity

CVSS 3.1

7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
3.8% chance of exploitation in the next 30 days; higher than 90% of CVEs (scores of 2026-10-31)
CWE
CWE-444
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-gwfg-cqmg-cf8fRubyGemswebrick>=1.6.0 <1.6.11.6.1
GHSA-gwfg-cqmg-cf8fRubyGemswebrick>=1.5.0 <1.5.11.5.1
GHSA-gwfg-cqmg-cf8fRubyGemswebrick<1.4.41.4.4

References

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