# CVE-2017-7963: Denial of service in n/a

> Attackers can cause denial of service via memory consumption and crashes in PHP GMP interfaces by processing long strings.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Apr 2017
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-266p-jjrg-gmfx, UBUNTU-CVE-2017-7963

## What is CVE-2017-7963?

CVE-2017-7963 is a high-severity denial of service vulnerability in Php Php, published on 19 Apr 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2017-7963?

It affects 1 product.


Products: Php Php.

## How do I fix CVE-2017-7963?

No fix has been published for CVE-2017-7963 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-7963 being exploited?

There is no known exploitation of CVE-2017-7963 in the wild and no public exploit code.

## Other vulnerabilities in Php Php

- [CVE-2012-2688](https://insights.sbomify.com/CVE-2012-2688/): Integer overflow in n/a (critical 10.0)
- [CVE-2012-2376](https://insights.sbomify.com/CVE-2012-2376/): Memory corruption in n/a (critical 10.0)
- [CVE-2011-3268](https://insights.sbomify.com/CVE-2011-3268/): Memory corruption in n/a (critical 10.0)
- [CVE-2009-4143](https://insights.sbomify.com/CVE-2009-4143/): Other in n/a (critical 10.0)
- [CVE-2008-5557](https://insights.sbomify.com/CVE-2008-5557/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-7963 and fix it if it is affected.

What it is: CVE-2017-7963 is a high-severity denial of service vulnerability in Php Php, published on 19 Apr 2017. 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-2017-7963 in the wild and no public exploit code.

Affected product: Php Php. 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-2017-7963/ (Markdown: https://insights.sbomify.com/CVE-2017-7963/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-7963
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-7963
- OSV: https://osv.dev/vulnerability/CVE-2017-7963

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-7963/
Summaries are generated and may contain mistakes; the official description above is the record.