CVE-2024-12084: A heap-based buffer overflow flaw was found in the rsync daemon

Q: How do I fix CVE-2024-12084?

rsync: downgrade or apply the listed mitigation; almalinux: mitigate or apply the listed mitigation; arch linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2024-12084 being exploited?

CVE-2024-12084 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-12084 affect?

CVE-2024-12084 affects rsync, almalinux, arch linux. Severity is critical (CVSS 9.8). 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

Q: How urgent is CVE-2024-12084?

Priority 77/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.8REMOTEWATCHLISTDOWNGRADEMITIGATEMITIGATE

CVE-2024-12084 is a critical-severity flaw (CVSS 9.8) affecting rsync, almalinux, arch linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	72.5% (top 1%)
CISA exploited list	No
Weakness	CWE-122, CWE-787
Published	2025-01-15
Last modified	2026-10-21

Publisher (CNA): Red Hat, Inc. · Vendor: almalinux · archlinux · gentoo · nixos · novell · samba

Last updated 2026-10-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-01-15 15:15 UTCPublished CVE record published
2026-10-21 17:17 UTCUpdated Record last modified

samba rsync DOWNGRADE

Affected: 3.2.7 · 3.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.7

1. Check installed version

apt-cache policy rsync || rpm -q rsync || rsync --version

2. No fixed release: DOWNGRADE to a release before 3.2.7 (Debian / Ubuntu)

apt-cache madison rsync sudo apt install rsync=<VERSION_BEFORE_3.2.7> sudo apt-mark hold rsync

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list rsync sudo dnf downgrade rsync-<VERSION_BEFORE_3.2.7> sudo dnf versionlock add rsync

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

almalinux almalinux MITIGATE

Affected: 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

archlinux arch linux MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

gentoo linux MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

nixos nixos UPGRADE

Affected: < 24.11 · 24.11

Fixed in: 24.11

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

novell suse linux MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · opensips · FIXED · 4.0.3-1.fc46 · FEDORA-2026-6700a0026c · source

sudo dnf upgrade --advisory=FEDORA-2026-6700a0026c

Fedora ELN · ibus-typing-booster · FIXED · 2.31.3-1.eln159 · FEDORA-2026-c895c68d60 · source

sudo dnf upgrade --advisory=FEDORA-2026-c895c68d60

Ubuntu 20.04 · rsync · NOT AFFECTED

Ubuntu 24.10 · rsync · FIXED · 3.3.0-1ubuntu0.1

sudo apt update && sudo apt install --only-upgrade rsync dpkg --compare-versions "$(dpkg-query -W -f='${Version}' rsync)" ge "3.3.0-1ubuntu0.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · rsync · FIXED · 3.2.7-0ubuntu0.22.04.3

sudo apt update && sudo apt install --only-upgrade rsync dpkg --compare-versions "$(dpkg-query -W -f='${Version}' rsync)" ge "3.2.7-0ubuntu0.22.04.3" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · rsync · FIXED · 3.2.7-1ubuntu1.1

sudo apt update && sudo apt install --only-upgrade rsync dpkg --compare-versions "$(dpkg-query -W -f='${Version}' rsync)" ge "3.2.7-1ubuntu1.1" && echo PATCHED || echo STILL-VULNERABLE

Debian 12 · rsync · FIXED · 3.2.7-1+deb12u1

sudo apt update && sudo apt install --only-upgrade rsync dpkg --compare-versions "$(dpkg-query -W -f='${Version}' rsync)" ge "3.2.7-1+deb12u1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · rsync · FIXED · 3.3.0+ds1-3

sudo apt update && sudo apt install --only-upgrade rsync dpkg --compare-versions "$(dpkg-query -W -f='${Version}' rsync)" ge "3.3.0+ds1-3" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · rsync · FIXED · rsync-3.4.1-2.el10

sudo dnf upgrade --advisory=RHBA-2025:6470 rpm -q rsync

RHEL 6 · rsync · NOT AFFECTED

RHEL 7 · rsync · NOT AFFECTED

RHEL 8 · rsync · NOT AFFECTED

RHEL 9 · rsync · NOT AFFECTED

Alpine 3.20 · rsync · FIXED · rsync-3.4.0-r0

apk add --upgrade rsync apk info -v rsync

Alpine 3.21 · rsync · FIXED · rsync-3.4.0-r0

apk add --upgrade rsync apk info -v rsync

Alpine 3.22 · rsync · FIXED · rsync-3.4.0-r0

apk add --upgrade rsync apk info -v rsync

Alpine 3.23 · rsync · FIXED · rsync-3.4.0-r0

apk add --upgrade rsync apk info -v rsync

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: themirze/cve-2024-12084 (4 stars)
GitHub PoC: rxerium/CVE-2024-12084 (1 stars)
GitHub PoC: InkeyP/CVE-2024-12084 (1 stars)
Write-up: github.com/google/security-research/security/advisories/GHSA-p5pg-x43v-mvqj

Advisories and coverage

Official advisories

GitLab Security Releases: GitLab Patch Release: 18.1.2, 18.0.4, 17.11.6 2025-07-09

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-12084?

rsync: downgrade or apply the listed mitigation; almalinux: mitigate or apply the listed mitigation; arch linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-12084 being exploited?

CVE-2024-12084 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-12084 affect?

CVE-2024-12084 affects rsync, almalinux, arch linux. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2024-12084?

Priority 77/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Samba vulnerabilities

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References

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