PatchTheCVECVE-2001-0815: Buffer overflow in PerlIS.dll in Activestate ActivePerl 5.6.1.629 and earlier allows remote attackers to execu
CVE-2001-0815 is a high-severity flaw (CVSS 7.5) affecting activeperl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Buffer overflow in PerlIS.dll in Activestate ActivePerl 5.6.1.629 and earlier allows remote attackers to execute arbitrary code via an HTTP request for a long filename that ends in a .pl extension.
Why this priority
- High severity
- EPSS top 3%: very likely to be exploited
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| EPSS exploit chance | 14.4% (top 3%) |
| CISA exploited list | No |
| Published | 2001-12-06 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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: ActivePerl 5.6.1 - 'perlIIS.dll' Remote Buffer Overflow (1)
- Exploit-DB: ActivePerl 5.6.1 - 'perlIIS.dll' Remote Buffer Overflow (3)
- Exploit-DB: ActivePerl 5.6.1 - 'perlIIS.dll' Remote Buffer Overflow (2)
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-2001-0815?
activeperl: upgrade to newer than 5.6.1.629. Exact commands for each OS are on this page.
Is CVE-2001-0815 being exploited?
CVE-2001-0815 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-2001-0815 affect?
CVE-2001-0815 affects activeperl. Severity is high (CVSS 7.5). Buffer overflow in PerlIS.dll in Activestate ActivePerl 5.6.1.629 and earlier allows remote attackers to execute arbitrary code via an HTTP request for a long filename that ends in a .pl extension.
How urgent is CVE-2001-0815?
Priority 55/100. High severity; EPSS top 3%: very likely to be exploited; Public exploit reference
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