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Advisory record · GHSA-2cwj-8chv-9pp9

XML External Entity attack in log4net

CVSS 9.8 CriticalCriticalEPSS 0.18 · 97th percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.
  • CVSS score 9.8 (7.0 or more) and EPSS 0.18 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the GitHub Advisory Database at 29 Jan 2021, 19:47 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
log4netNuGet<2.0.102.0.10
Identifiers
GHSA-2cwj-8chv-9pp9 · CVE-2018-1285
Weakness (CWE)
CWE-611
Tags
Published
29 Jan 2021
Updated
12 Mar 2024

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of log4net before 2.0.10 do not disable XML external entity processing when parsing configuration files. An attacker who can supply a log4net configuration file to an application that accepts user-provided configuration can carry out XXE attacks. Upgrade log4net to version 2.0.10 or later. The source gives few details on the exact impact.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.18, the 97th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:24 UTC First seen by agentprime
  2. 31 Oct 2026, 15:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.