CVE-2001-1413: Stack-based buffer overflow in the comprexx function for ncompress 4.2.4 and earlier, when used in situations

Q: How do I fix CVE-2001-1413?

ncompress: upgrade to newer than 4.2.4. Exact commands for each OS are on this page.

Q: Is CVE-2001-1413 being exploited?

CVE-2001-1413 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-2001-1413 affect?

CVE-2001-1413 affects ncompress. Severity is high (CVSS 7.5). Stack-based buffer overflow in the comprexx function for ncompress 4.2.4 and earlier, when used in situations that cross security boundaries (such as FTP server), may allow remote attackers to execute arbitrary code via a long filename argu

Q: How urgent is CVE-2001-1413?

Priority 49/100. High severity; EPSS top 8%: very likely to be exploited

This month

HIGH 7.5UPGRADE

CVE-2001-1413 is a high-severity flaw (CVSS 7.5) affecting ncompress. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in the comprexx function for ncompress 4.2.4 and earlier, when used in situations that cross security boundaries (such as FTP server), may allow remote attackers to execute arbitrary code via a long filename argument.

Why this priority

High severity
EPSS top 8%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	4.8% (top 8%)
CISA exploited list	No
Published	2004-12-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ncompress

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

Am I affected?

Timeline

2004-12-23 05:00 UTCPublished CVE record published
2026-06-16 21:56 UTCUpdated Record last modified

ncompress ncompress UPGRADE

Affected: <= 4.2.4

Fixed in: newer than 4.2.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 4.2.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ncompress

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ncompress

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2001-1413?

ncompress: upgrade to newer than 4.2.4. Exact commands for each OS are on this page.

Is CVE-2001-1413 being exploited?

CVE-2001-1413 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-2001-1413 affect?

CVE-2001-1413 affects ncompress. Severity is high (CVSS 7.5). Stack-based buffer overflow in the comprexx function for ncompress 4.2.4 and earlier, when used in situations that cross security boundaries (such as FTP server), may allow remote attackers to execute arbitrary code via a long filename argu

How urgent is CVE-2001-1413?

Priority 49/100. High severity; EPSS top 8%: very likely to be exploited

Related CVEs

CVE-2006-1168 HIGH 7.5 DOWNGRADE The decompress function in compress42.c in (1) ncompress 4.2.4 and (2) liblzw allows remote attackers to cause
CVE-2005-2991 LOW 2.1 UPGRADE ncompress 4.2.4 and earlier allows local users to overwrite arbitrary files via a symlink attack on temporary

References

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