---
title: "CVE-2010-4237\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2010-4237?format=md
keywords: index, follow
---

# CVE-2010-4237

Publication date 29 October 2019

Last updated 25 August 2025

---

Ubuntu priority

**Low**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.9 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2010-4237?format=md#impact-score)

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## Description

Mercurial before 1.6.4 fails to verify the Common Name field of SSL
certificates which allows remote attackers who acquire a certificate signed
by a Certificate Authority to perform a man-in-the-middle attack.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2010-4237?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| mercurial | 13.10 saucy | Not affected |
| 13.04 raring | Not affected |
| 12.10 quantal | Not affected |
| 12.04 LTS precise | Not affected |
| 11.10 oneiric | Not affected |
| 11.04 natty | Not affected |
| 10.04 LTS lucid | Ignored end of life |
| 8.04 LTS hardy | Ignored end of life |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2010-4237?format=md#patch-details)

## Notes

---

### [sbeattie](https://launchpad.net/~sbeattie)

may not be an issue for lucid and earlier due to python being
v2.6 or older

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| mercurial | * Upstream:   <http://selenic.com/repo/hg-stable/diff/f2937d6492c5/mercurial/url.py> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.9 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | High |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.9 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-4237)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2010-4237)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2010-4237)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2010-4237)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2010-4237>