How severe is CVE-2001-0537?

No CVSS score has been assigned to CVE-2001-0537 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2001-0537?

Affected package information for CVE-2001-0537 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2001-0537?

No fixed version has been published for CVE-2001-0537 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2001-0537 actively exploited in the wild?

Yes. There are 8 known exploit references for CVE-2001-0537, including 4 documented proof-of-concept exploits on Exploit-DB and 4 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2001-0537?

CVE-2001-0537 has an EPSS (Exploit Prediction Scoring System) score of 93.8%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2001-0537?

CVE-2001-0537 is classified as Improper Authentication (CWE-287). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2001-0537?

CVE-2001-0537 affects cisco ios (91 versions, e.g. 11.3, 11.3aa, 11.3da…). Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2001-0537?

A Nuclei detection template exists for CVE-2001-0537, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2001-0537 published, and has it been updated?

CVE-2001-0537 was published on July 21, 2001 and was last updated on April 16, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2001-0537

HTTP server for Cisco IOS 11.3 to 12.2 allows attackers to bypass authentication and execute arbitrary commands, when local authorization is being used, by specifying a high access level in the URL.

Published

Jul 21, 2001

Updated

Apr 16, 2026

Affected

0 pkgs

Patched

None yet

Exploits

8 known

EPSS Exploitation Probability

via FIRST.org ↗

93.8%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

HTTP server for Cisco IOS 11.3 to 12.2 allows attackers to bypass authentication and execute arbitrary commands, when local authorization is being used, by specifying a high access level in the URL.

Affected Products

1 product · 91 configurations

ioscisco

91 versions

11.311.3aa11.3da11.3db11.3ha11.3ma11.3na11.3t11.3xa12.012.0\(5\)xk12.0\(7\)xk

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-20978remotehardware✓ Verified

Cisco IOS 11.x/12.x - HTTP Configuration Arbitrary Administrative Access (4)

by blackangels · Jun 27, 2001

Exploit-DB Source

EDB-20976remotehardware✓ Verified

Cisco IOS 11.x/12.x - HTTP Configuration Arbitrary Administrative Access (2)

by Eliel C. Sardanons · Jun 27, 2001

Exploit-DB Source

EDB-20975remotehardware✓ Verified

Cisco IOS 11.x/12.x - HTTP Configuration Arbitrary Administrative Access (1)

by cronos · Jun 27, 2001

Exploit-DB Source

EDB-20977remotehardware✓ Verified

Cisco IOS 11.x/12.x - HTTP Configuration Arbitrary Administrative Access (3)

by hypoclear · Mar 7, 2001

Exploit-DB Source

Frequently Asked Questions

HTTP server for Cisco IOS 11.3 to 12.2 allows attackers to bypass authentication and execute arbitrary commands, when local authorization is being used, by specifying a high access level in the URL.

O3 Security · Impact-Aware SCA

Is CVE-2001-0537 in your stack?

O3 detects CVE-2001-0537 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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