CVE-2005-1953: Heap-based buffer overflow in the CGI extension for Pico Server (pServ) 3.3 allows remote attackers to execute

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HIGH 7.5DOWNGRADE

CVE-2005-1953 is a high-severity flaw (CVSS 7.5) affecting pico server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in the CGI extension for Pico Server (pServ) 3.3 allows remote attackers to execute arbitrary code via a long HTTP request.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.2% (top 12%)
CISA exploited list	No
Published	2005-06-11
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: pico server

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

Am I affected?

Timeline

2005-06-11 04:00 UTCPublished CVE record published
2026-06-16 22:13 UTCUpdated Record last modified

pico server pico server DOWNGRADE

Affected: 3.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.3

1. Check installed version

apt-cache policy pico-server || rpm -q pico-server || pico-server --version

2. No fixed release: DOWNGRADE to a release before 3.3 (Debian / Ubuntu)

apt-cache madison pico-server sudo apt install pico-server=<VERSION_BEFORE_3.3> sudo apt-mark hold pico-server

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

dnf --showduplicates list pico-server sudo dnf downgrade pico-server-<VERSION_BEFORE_3.3> sudo dnf versionlock add pico-server

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.

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-2005-1953?

pico server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2005-1953 being exploited?

CVE-2005-1953 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-2005-1953 affect?

CVE-2005-1953 affects pico server. Severity is high (CVSS 7.5). Heap-based buffer overflow in the CGI extension for Pico Server (pServ) 3.3 allows remote attackers to execute arbitrary code via a long HTTP request.

How urgent is CVE-2005-1953?

Priority 48/100. High severity

Related CVEs

CVE-2005-1952 HIGH 7.5 DOWNGRADE Directory traversal vulnerability in Pico Server (pServ) 3.3 allows remote attackers to read arbitrary files a
CVE-2005-1367 HIGH 7.5 DOWNGRADE Pico Server (pServ) 3.2 and earlier allows local users to read arbitrary files as the pServ user via a symlink
CVE-2005-1366 HIGH 7.5 DOWNGRADE Pico Server (pServ) 3.2 and earlier allows remote attackers to obtain the source code for CGI scripts via "dir
CVE-2005-1365 HIGH 10.0 DOWNGRADE Pico Server (pServ) 3.2 and earlier allows remote attackers to execute arbitrary commands via a URL with multi
CVE-2002-2295 HIGH 7.5 DOWNGRADE Buffer overflow in Pico Server (pServ) 2.0 beta 1 through beta 5 allows remote attackers to cause a denial of

References

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