GHSA-vc5p-v9hr-52mj

Suggest an improvement
Source
https://github.com/advisories/GHSA-vc5p-v9hr-52mj
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/12/GHSA-vc5p-v9hr-52mj/GHSA-vc5p-v9hr-52mj.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-vc5p-v9hr-52mj
Downstream
Published
2025-12-18T21:31:44Z
Modified
2025-12-19T22:16:04.156199Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/SA:N CVSS Calculator
Summary
Apache Log4j does not verify the TLS hostname in its Socket Appender
Details

The Socket Appender in Apache Log4j Core versions 2.0-beta9 through 2.25.2 does not perform TLS hostname verification of the peer certificate, even when the verifyHostName configuration attribute or the log4j2.sslVerifyHostName system property is set to true.

This issue may allow a man-in-the-middle attacker to intercept or redirect log traffic under the following conditions:

  • The attacker is able to intercept or redirect network traffic between the client and the log receiver.
  • The attacker can present a server certificate issued by a certification authority trusted by the Socket Appender’s configured trust store (or by the default Java trust store if no custom trust store is configured).

Users are advised to upgrade to Apache Log4j Core version 2.25.3, which addresses this issue.

As an alternative mitigation, the Socket Appender may be configured to use a private or restricted trust root to limit the set of trusted certificates.

Database specific 
{
    "github_reviewed": true,
    "severity": "MODERATE",
    "nvd_published_at": "2025-12-18T21:15:57Z",
    "github_reviewed_at": "2025-12-19T22:08:02Z",
    "cwe_ids": [
        "CWE-297"
    ]
}
References

Affected packages

Maven / org.apache.logging.log4j:log4j-core

Package

Name
org.apache.logging.log4j:log4j-core
View open source insights on deps.dev
Purl
pkg:maven/org.apache.logging.log4j/log4j-core

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.0-beta9
Fixed
2.25.3

Affected versions

2.*

2.0-beta9
2.0-rc1
2.0-rc2
2.0
2.0.1
2.0.2
2.1
2.2
2.3
2.3.1
2.3.2
2.4
2.4.1
2.5
2.6
2.6.1
2.6.2
2.7
2.8
2.8.1
2.8.2
2.9.0
2.9.1
2.10.0
2.11.0
2.11.1
2.11.2
2.12.0
2.12.1
2.12.2
2.12.3
2.12.4
2.13.0
2.13.1
2.13.2
2.13.3
2.14.0
2.14.1
2.15.0
2.16.0
2.17.0
2.17.1
2.17.2
2.18.0
2.19.0
2.20.0
2.21.0
2.21.1
2.22.0
2.22.1
2.23.0
2.23.1
2.24.0
2.24.1
2.24.2
2.24.3
2.25.0
2.25.1
2.25.2

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/12/GHSA-vc5p-v9hr-52mj/GHSA-vc5p-v9hr-52mj.json"