# CVE-2010-3493: Race condition in n/a

> Remote attackers can cause a denial of service in the Python smtpd module by exploiting race conditions during TCP connection handling.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 19 Oct 2010
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-5rjw-m4xp-g2m7, PSF-2010-7

## What is CVE-2010-3493?

CVE-2010-3493 is a medium-severity vulnerability in Python Python, published on 19 Oct 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Multiple race conditions in smtpd.py in the smtpd module in Python 2.6, 2.7, 3.1, and 3.2 alpha allow remote attackers to cause a denial of service (daemon outage) by establishing and then immediately closing a TCP connection, leading to the accept function having an unexpected return value of None, an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, or the getpeername function having an ENOTCONN error, a related issue to CVE-2010-3492.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2010-3493?

It affects 1 product.


Products: Python Python.

## How do I fix CVE-2010-3493?

Upgrade to a fixed version.

## Is CVE-2010-3493 being exploited?

There is no known exploitation of CVE-2010-3493 in the wild and no public exploit code.

## Other vulnerabilities in Python Python

- [CVE-2008-5031](https://insights.sbomify.com/CVE-2008-5031/): Integer overflow in n/a (critical 10.0)
- [CVE-2014-4650](https://insights.sbomify.com/CVE-2014-4650/): Path traversal in n/a (critical 9.8)
- [CVE-2016-5636](https://insights.sbomify.com/CVE-2016-5636/): Integer overflow in n/a (critical 9.8)
- [CVE-2007-4559](https://insights.sbomify.com/CVE-2007-4559/): Path traversal in n/a (critical 9.8)
- [CVE-2017-17522](https://insights.sbomify.com/CVE-2017-17522/): Command injection in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2010-3493 and fix it if it is affected.

What it is: CVE-2010-3493 is a medium-severity vulnerability in Python Python, published on 19 Oct 2010. 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-2010-3493 in the wild and no public exploit code.

Affected product: Python Python. 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-2010-3493/ (Markdown: https://insights.sbomify.com/CVE-2010-3493/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2010-3493
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2010-3493
- OSV: https://osv.dev/vulnerability/CVE-2010-3493

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From sbomify Insights: https://insights.sbomify.com/CVE-2010-3493/
Summaries are generated and may contain mistakes; the official description above is the record.