# CVE-2013-1740: Security feature bypass in n/a

> Man-in-the-middle attackers can spoof SSL servers by exploiting TLS False Start in NSS, bypassing certificate validation.

- **Severity:** Medium 5.8 (`AV:N/AC:M/Au:N/C:P/I:P/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 18 Jan 2014
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2013-1740, GHSA-26rr-whcg-5f4g, MGASA-2014-0024

## What is CVE-2013-1740?

CVE-2013-1740 is a medium-severity vulnerability in Mozilla Network Security Services, published on 18 Jan 2014. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-310

## Which versions are affected by CVE-2013-1740?

It affects 1 product.


Products: Mozilla Network Security Services.

## How do I fix CVE-2013-1740?

Upgrade to a fixed version.

## Is CVE-2013-1740 being exploited?

There is no known exploitation of CVE-2013-1740 in the wild and no public exploit code.

## Other vulnerabilities in Mozilla Network Security Services

- [CVE-2019-17006](https://insights.sbomify.com/CVE-2019-17006/): Memory corruption in NSS (critical 9.8)
- [CVE-2017-5461](https://insights.sbomify.com/CVE-2017-5461/): Memory corruption in Firefox (critical 9.8)
- [CVE-2009-2404](https://insights.sbomify.com/CVE-2009-2404/): Memory corruption in n/a (critical 9.3)
- [CVE-2017-11695](https://insights.sbomify.com/CVE-2017-11695/): Memory corruption in n/a (high 7.8)
- [CVE-2017-11696](https://insights.sbomify.com/CVE-2017-11696/): Memory corruption in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2013-1740 and fix it if it is affected.

What it is: CVE-2013-1740 is a medium-severity vulnerability in Mozilla Network Security Services, published on 18 Jan 2014. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2013-1740 in the wild and no public exploit code.

Affected product: Mozilla Network Security Services. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2013-1740/ (Markdown: https://insights.sbomify.com/CVE-2013-1740/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-1740
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-1740
- OSV: https://osv.dev/vulnerability/CVE-2013-1740

---
From sbomify Insights: https://insights.sbomify.com/CVE-2013-1740/
Summaries are generated and may contain mistakes; the official description above is the record.