CVE-2005-1086: Buffer overflow in the cmdIS.DLL plugin for AN HTTPD Server 1.42n allows remote attackers to execute arbitrary

This month

MEDIUM 6.4DOWNGRADE

CVE-2005-1086 is a medium-severity flaw (CVSS 6.4) affecting an-httpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the cmdIS.DLL plugin for AN HTTPD Server 1.42n allows remote attackers to execute arbitrary code via an HTTP request with a long User-Agent header.

Why this priority

EPSS top 7%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	6.4 (Medium)
EPSS exploit chance	5.6% (top 7%)
CISA exploited list	No
Published	2005-05-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: an

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

Am I affected?

Timeline

2005-05-02 04:00 UTCPublished CVE record published
2026-06-16 22:12 UTCUpdated Record last modified

an an-httpd DOWNGRADE

Affected: 1.42n

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.42n

1. Check installed version

apt-cache policy an-httpd || rpm -q an-httpd || an-httpd --version

2. No fixed release: DOWNGRADE to a release before 1.42n (Debian / Ubuntu)

apt-cache madison an-httpd sudo apt install an-httpd=<VERSION_BEFORE_1.42n> sudo apt-mark hold an-httpd

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

dnf --showduplicates list an-httpd sudo dnf downgrade an-httpd-<VERSION_BEFORE_1.42n> sudo dnf versionlock add an-httpd

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.

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: AN HTTPD - 'CMDIS.dll' Remote Buffer Overflow (PoC)

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-2005-1086?

an-httpd: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2005-1086 being exploited?

CVE-2005-1086 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-2005-1086 affect?

CVE-2005-1086 affects an-httpd. Severity is medium (CVSS 6.4). Buffer overflow in the cmdIS.DLL plugin for AN HTTPD Server 1.42n allows remote attackers to execute arbitrary code via an HTTP request with a long User-Agent header.

How urgent is CVE-2005-1086?

Priority 51/100. EPSS top 7%: very likely to be exploited; Public exploit reference

Software pages

Apache HTTP Server vulnerabilities

Related CVEs

CVE-2006-1598 HIGH 7.8 UPGRADE AN HTTPD 1.42n, and possibly other versions before 1.42p, allows remote attackers to obtain source code of scr
CVE-2005-1087 MEDIUM 6.4 DOWNGRADE CRLF injection vulnerability in the cmdIS.DLL plugin for AN HTTPD Server 1.42n allows remote attackers to spoo
CVE-2002-1930 HIGH 7.5 DOWNGRADE Buffer overflow in AN HTTPd 1.38 through 1.4.1c allows remote attackers to execute arbitrary code via a SOCKS4

References

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