# CVE-2020-10543: Integer overflow in n/a

> A heap-based buffer overflow in Perl on 32-bit platforms allows attackers to execute arbitrary code or cause denial of service via nested regular expression quantifiers.

- **Severity:** High 8.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Jun 2020
- **Updated:** 14 Oct 2026
- **Also known as:** ALPINE-CVE-2020-10543, CLEANSTART-2026-RP32633, CLSA-2021-1632328264, CLSA-2021-1634922942, DEBIAN-CVE-2020-10543, UBUNTU-CVE-2020-10543

## What is CVE-2020-10543?

CVE-2020-10543 is a high-severity vulnerability in Fedoraproject Fedora, published on 5 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Perl before 5.30.3 on 32-bit platforms allows a heap-based buffer overflow because nested regular expression quantifiers have an integer overflow.

Weakness: CWE-787 (Out-of-bounds Write), CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2020-10543?

It affects 15 products.


Products: Fedoraproject Fedora, Opensuse Leap, Oracle Communications Billing and Revenue Management, Oracle Communications Diameter Signaling Router, Oracle Communications Eagle Application Processor, Oracle Communications Eagle Lnp Application Processor, Oracle Communications Lsms, Oracle Communications Offline Mediation Controller, Oracle Communications Performance Intelligence Center, Oracle Communications Pricing Design Center, Oracle Configuration Manager, Oracle Enterprise Manager Base Platform, Oracle Sd-Wan Edge, Oracle Tekelec Platform Distribution, Perl Perl.

## How do I fix CVE-2020-10543?

Upgrade to a fixed version.

## Is CVE-2020-10543 being exploited?

There is no known exploitation of CVE-2020-10543 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-10543 and fix it if it is affected.

What it is: CVE-2020-10543 is a high-severity vulnerability in Fedoraproject Fedora, published on 5 Jun 2020. 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-2020-10543 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2020-10543/ (Markdown: https://insights.sbomify.com/CVE-2020-10543/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-10543
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-10543
- OSV: https://osv.dev/vulnerability/CVE-2020-10543

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-10543/
Summaries are generated and may contain mistakes; the official description above is the record.