CVE-2025-27820: httpclient Cert Validation Flaw — Fix

Description

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

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness Type (CWE)

CWE-295 CWE-295

Affected Products

Vendor	Product	Versions
apache	httpclient	5.4 — 5.4.3
netapp	ontap_tools	All

References

Advisories & Patches

https://github.com/apache/httpcomponents-client/pull/574 https://github.com/apache/httpcomponents-client/pull/621 https://lists.apache.org/thread/55xhs40ncqv97qvoocok44995xp5kqn8

Other References

https://hc.apache.org/httpcomponents-client-5.4.x/index.html https://security.netapp.com/advisory/ntap-20250516-0003/

Frequently Asked Questions

What is 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 It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-27820? +

CVE-2025-27820 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-27820? +

CVE-2025-27820 affects products from apache, netapp, specifically: httpclient, ontap_tools. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-27820? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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