Vulnerability in Apache Httpclient
CVE-2025-27820
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
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.009 (60.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Apache Httpclient
- Apache Software Foundation Httpcomponents — versions 5.4.0
- NetApp Ontap Tools — versions 10
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/apache/httpcomponents-client/pull/574 (Patch, patch, Issue Tracking)
- github.com/apache/httpcomponents-client/pull/621 (Patch, patch, Issue Tracking)
- hc.apache.org/httpcomponents-client-5.4.x/index.html (Product, product)
- lists.apache.org/thread/55xhs40ncqv97qvoocok44995xp5kqn8 (vendor-advisory, Patch, Mailing List)
- af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)
Frequently asked questions
- What is CVE-2025-27820?
- CVE-2025-27820 is a high-severity vulnerability in Apache Httpclient, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2025-04-24.
- How severe is CVE-2025-27820?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-27820 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.