CVE-2002-1816: Off-by-one buffer overflow in the sock_gets function in sockhelp.c for ATPhttpd 0.4b and earlier allows remote

Q: How do I fix CVE-2002-1816?

atphttpd: upgrade to newer than 0.4b. Exact commands for each OS are on this page.

Q: Is CVE-2002-1816 being exploited?

CVE-2002-1816 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-2002-1816 affect?

CVE-2002-1816 affects atphttpd. Severity is critical (CVSS 9.8). Off-by-one buffer overflow in the sock_gets function in sockhelp.c for ATPhttpd 0.4b and earlier allows remote attackers to execute arbitrary code via a long HTTP GET request.

Q: How urgent is CVE-2002-1816?

Priority 68/100. Critical severity; EPSS top 5%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2002-1816 is a critical-severity flaw (CVSS 9.8) affecting atphttpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Off-by-one buffer overflow in the sock_gets function in sockhelp.c for ATPhttpd 0.4b and earlier allows remote attackers to execute arbitrary code via a long HTTP GET request.

Why this priority

Critical severity
EPSS top 5%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

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	9.0% (top 5%)
CISA exploited list	No
Weakness	CWE-193
Published	2002-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: redshift

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

Am I affected?

Timeline

2002-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:00 UTCUpdated Record last modified

redshift atphttpd UPGRADE

Affected: <= 0.4b

Fixed in: newer than 0.4b

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.4b (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade atphttpd

Note

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

Public exploits and detection

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

Exploit-DB: ATP HTTPd 0.4 - Single Byte Buffer Overflow

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-2002-1816?

atphttpd: upgrade to newer than 0.4b. Exact commands for each OS are on this page.

Is CVE-2002-1816 being exploited?

CVE-2002-1816 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-2002-1816 affect?

CVE-2002-1816 affects atphttpd. Severity is critical (CVSS 9.8). Off-by-one buffer overflow in the sock_gets function in sockhelp.c for ATPhttpd 0.4b and earlier allows remote attackers to execute arbitrary code via a long HTTP GET request.

How urgent is CVE-2002-1816?

Priority 68/100. Critical severity; EPSS top 5%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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