CVE-2001-0425: AdLibrary.pm in AdCycle 0.78b allows remote attackers to gain privileges to AdCycle via a malformed Agent: hea

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HIGH 7.5DOWNGRADE

CVE-2001-0425 is a high-severity flaw (CVSS 7.5) affecting adcycle. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

AdLibrary.pm in AdCycle 0.78b allows remote attackers to gain privileges to AdCycle via a malformed Agent: header in the HTTP request, which is inserted into a resulting SQL query that is used to verify login information.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Published	2001-06-27
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: adcycle

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

Am I affected?

Timeline

2001-06-27 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

adcycle adcycle DOWNGRADE

Affected: 0.77 · 0.78b

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.77

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.77 (Debian / Ubuntu)

apt-cache madison adcycle sudo apt install adcycle=<VERSION_BEFORE_0.77> sudo apt-mark hold adcycle

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

dnf --showduplicates list adcycle sudo dnf downgrade adcycle-<VERSION_BEFORE_0.77> sudo dnf versionlock add adcycle

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: Adcycle 0.77/0.78 - AdLibrary.pm Session Access

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-2001-0425?

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

Is CVE-2001-0425 being exploited?

CVE-2001-0425 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-2001-0425 affect?

CVE-2001-0425 affects adcycle. Severity is high (CVSS 7.5). AdLibrary.pm in AdCycle 0.78b allows remote attackers to gain privileges to AdCycle via a malformed Agent: header in the HTTP request, which is inserted into a resulting SQL query that is used to verify login information.

How urgent is CVE-2001-0425?

Priority 52/100. High severity; Public exploit reference

Related CVEs

CVE-2001-1226 MEDIUM 5.0 DOWNGRADE AdCycle 1.17 and earlier allow remote attackers to modify SQL queries, which are not properly sanitized before
CVE-2001-1053 HIGH 10.0 DOWNGRADE AdLogin.pm in AdCycle 1.15 and earlier allows remote attackers to bypass authentication and gain privileges by
CVE-2000-1161 HIGH 7.5 DOWNGRADE The installation of AdCycle banner management system leaves the build.cgi program in a web-accessible director

References

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