CVE-2025-27820 | Apache HttpComponents: PSL (Public Suffix List) validation bypass

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

Published: 2025-04-24 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-27820 is rated Moderate Risk (47.6/100): CVSS High severity, with low exploitation likelihood (EPSS 0.71%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-27820

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.07% 0.71% +0.64%
2 2026-06-02 0.33% 0.07% -0.26%
3 2026-02-18 — 0.33% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-27820

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-27820

GitHub Security Advisory for CVE-2025-27820

GHSA-73m2-qfq3-56cx · Severity: high · Ecosystem: maven — Apache HttpClient disables domain checks

OS Trackers for CVE-2025-27820

vendor priority summary link
debian unimportant CVE-2025-27820 unimportant priority: Debian including 1 source packages (httpcomponents-client), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-27820
redhat medium — https://access.redhat.com/security/cve/CVE-2025-27820
suse high — https://www.suse.com/security/cve/CVE-2025-27820/
ubuntu medium CVE-2025-27820 medium priority: Ubuntu including 1 source packages (httpcomponents-client), 10 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 7, ignored 2, not-affected 1. https://ubuntu.com/security/CVE-2025-27820

Affected software / configurations for CVE-2025-27820

Vendor Product Version Raw CPE
apache httpclient >= 5.4, < 5.4.3 cpe:2.3:a:apache:httpclient:*:*:*:*:*:*:*:*
netapp ontap_tools 10 cpe:2.3:a:netapp:ontap_tools:10:*:*:*:*:vmware_vsphere:*:*

References for CVE-2025-27820

cvelogic Threat Intelligence