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Fencer Vulns
high 7.5

CVE-2025-27820 json

Apache HttpComponents: PSL (Public Suffix List) validation bypass

published 2025-04-24 18 mo ago modified 2026-09-10 1 mo ago also GHSA-73m2-qfq3-56cx , EUVD-2025-12102

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

A bug in PSL validation logic in Apache HttpClient 5.4.x disables domain checks, affecting cookie management and host name verification. Discovered by the Apache HttpClient team. Fixed in the 5.4.3 release

Patch / fix

  • maven org.apache.httpcomponents.client5:httpclient5 5.4.3
  • Apache Software Foundation Apache HttpComponents 5.4.3

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-27820 updated cvss 6.5

org.apache.httpcomponents.client5/httpclient5: Apache HttpComponents: PSL (Public Suffix List) validation bypass

  • Red Hat AMQ Clients httpclient5 Red Hat streams for Apache Kafka 2 httpclient5
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Cryostat 3 httpclient5 Red Hat Cryostat 4 httpclient5 Red Hat AMQ Broker 7 httpclient5 Red Hat build of Apache Camel - HawtIO 4 httpclient5 Red Hat build of Apache Camel 4 for Quarkus 3 quarkus-cxf-bom, quarkus-camel-bom Red Hat build of Apache Camel for Spring Boot 4 httpclient5
    +13 more products
    Red Hat build of Apicurio Registry 2 httpclient5 Red Hat build of Apicurio Registry 3 httpclient5 Red Hat build of Debezium 2 httpclient5 Red Hat build of Debezium 3 httpclient5 Red Hat Data Grid 8 httpclient5 Red Hat Fuse 7 httpclient5 Red Hat JBoss Enterprise Application Platform 7 httpclient5 Red Hat JBoss Enterprise Application Platform 8 httpclient5 Red Hat JBoss Enterprise Application Platform Expansion Pack httpclient5 Red Hat JBoss Web Server 6 httpclient5 Red Hat OpenShift AI (RHOAI) rhoai/odh-modelmesh-rhel8 Red Hat Process Automation 7 httpclient5 Red Hat streams for Apache Kafka httpclient5
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.97% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.httpcomponents.client5:httpclient5
>=5.4-alpha1, <5.4.3
5.4.3

Affected products

  • Apache Software Foundation Apache HttpComponents

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.