CVE-2001-0991

CVE-2001-0991 is a high-severity vulnerability in Scott R. Lemmon Proxomitron Naoko-4 with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

Cross-site scripting vulnerability in Proxomitron Naoko-4 BetaFour and earlier allows remote attackers to execute arbitrary script on other clients via an incorrect URL containing the malicious script, which is printed back in an error message.

Frequently asked questions

What is CVE-2001-0991?
Cross-site scripting vulnerability in Proxomitron Naoko-4 BetaFour and earlier allows remote attackers to execute arbitrary script on other clients via an incorrect URL containing the malicious script, which is printed back in an error message.
How severe is CVE-2001-0991?
CVE-2001-0991 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2001-0991 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-0991?
CVE-2001-0991 primarily affects Scott R. Lemmon Proxomitron Naoko-4. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2001-0991?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2001-0991 published?
CVE-2001-0991 was published on 2001-07-24 and last updated on 2026-06-16.

References

Affected products (4)