---
title: "CVE-2017-7963\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-2017-7963?format=md
keywords: index, follow
---

# CVE-2017-7963

Publication date 19 April 2017

Last updated 4 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2017-7963?format=md#impact-score)

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## Description

The GNU Multiple Precision Arithmetic Library (GMP) interfaces for PHP
through 7.1.4 allow attackers to cause a denial of service (memory
consumption and application crash) via operations on long strings. NOTE:
the vendor disputes this, stating "There is no security issue here, because
GMP safely aborts in case of an OOM condition. The only attack vector here
is denial of service. However, if you allow attacker-controlled, unbounded
allocations you have a DoS vector regardless of GMP's OOM behavior.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2017-7963?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| php5 | 17.04 zesty | Not in release |
| 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Ignored |
| 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)

disputed, marking as ignored

## 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 | None |
  | Integrity impact | None |
  | Availability impact | High |
* 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:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7963)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-7963)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-7963)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-7963)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2017-7963>