---
title: "CVE-2015-8618\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-2015-8618?format=md
keywords: index, follow
---

# CVE-2015-8618

Publication date 27 January 2016

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2015-8618?format=md#impact-score)

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## Description

The Int.Exp Montgomery code in the math/big library in Go 1.5.x before
1.5.3 mishandles carry propagation and produces incorrect output, which
makes it easier for attackers to obtain private RSA keys via unspecified
vectors.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2015-8618?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| golang | 18.04 LTS bionic | Not in release |
| 17.10 artful | Not in release |
| 17.04 zesty | Not in release |
| 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Not in release |
| 15.10 wily | Ignored end of life |
| 15.04 vivid | Ignored end of life |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | 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)

## Notes

---

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

Packages built using golang need to be rebuilt once the
vulnerability has been fixed. This CVE entry does not
list packages that need rebuilding outside of the main
repository or the Ubuntu variants with PPA overlays.
TODO: add main packages an packages in the overlays to this CVE

---

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

Vulnerability introduced in 1.5.x

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8618)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-8618)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-8618)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-8618)

### Other references

* <https://go-review.googlesource.com/#/c/17672/>
* <http://www.openwall.com/lists/oss-security/2015/12/21/6>
* <https://www.cve.org/CVERecord?id=CVE-2015-8618>