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CVE-2004-0418: serve_notify in CVS 1.12.x through 1.12.8, and 1.11.x through 1.11.16, does not properly handle empty data lin

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HIGH 10.0WATCHLISTDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2004-0418 is a high-severity flaw (CVSS 10.0) affecting cvs, openpkg, propack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

serve_notify in CVS 1.12.x through 1.12.8, and 1.11.x through 1.11.16, does not properly handle empty data lines, which may allow remote attackers to perform an "out-of-bounds" write for a single byte to execute arbitrary code or modify critical program data.

Why this priority

  • Critical severity
  • EPSS top 7%: very likely to be exploited
  • On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score10.0 (High)
EPSS exploit chance5.7% (top 7%)
CISA exploited listNo
Published2004-08-06
Last modified2026-06-16
Publisher (CNA): MITRE · Vendor: cvs · gentoo · openbsd · openpkg · sgi

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Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

cvs cvs DOWNGRADE
Affected: 1.10.7 · 1.10.8 · 1.11 · 1.11.1 · 1.11.1_p1 · 1.11.2 · 1.11.3 · 1.11.4
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.10.7
1. Check installed version
apt-cache policy cvs || rpm -q cvs || cvs --version
2. No fixed release: DOWNGRADE to a release before 1.10.7 (Debian / Ubuntu)
apt-cache madison cvs sudo apt install cvs=<VERSION_BEFORE_1.10.7> sudo apt-mark hold cvs
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list cvs sudo dnf downgrade cvs-<VERSION_BEFORE_1.10.7> sudo dnf versionlock add cvs
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.
openpkg openpkg DOWNGRADE
Affected: all versions · 1.3 · 2.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.3
1. Check installed version
apt-cache policy openpkg || rpm -q openpkg || openpkg --version
2. No fixed release: DOWNGRADE to a release before 1.3 (Debian / Ubuntu)
apt-cache madison openpkg sudo apt install openpkg=<VERSION_BEFORE_1.3> sudo apt-mark hold openpkg
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list openpkg sudo dnf downgrade openpkg-<VERSION_BEFORE_1.3> sudo dnf versionlock add openpkg
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.
sgi propack DOWNGRADE
Affected: 2.4 · 3.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.4
1. Check installed version
apt-cache policy propack || rpm -q propack || propack --version
2. No fixed release: DOWNGRADE to a release before 2.4 (Debian / Ubuntu)
apt-cache madison propack sudo apt install propack=<VERSION_BEFORE_2.4> sudo apt-mark hold propack
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list propack sudo dnf downgrade propack-<VERSION_BEFORE_2.4> sudo dnf versionlock add propack
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.
gentoo linux MITIGATE
Affected: 1.4
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.4
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.
openbsd openbsd MITIGATE
Affected: all versions · 3.4 · 3.5
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.4
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.
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-2004-0418?

cvs: downgrade or apply the listed mitigation; openpkg: downgrade or apply the listed mitigation; propack: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-0418 being exploited?

CVE-2004-0418 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-2004-0418 affect?

CVE-2004-0418 affects cvs, openpkg, propack. Severity is high (CVSS 10.0). serve_notify in CVS 1.12.x through 1.12.8, and 1.11.x through 1.11.16, does not properly handle empty data lines, which may allow remote attackers to perform an "out-of-bounds" write for a single byte to execute arbitrary code or modify cri

How urgent is CVE-2004-0418?

Priority 63/100. Critical severity; EPSS top 7%: very likely to be exploited; On your watchlist

Related CVEs

References

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