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Fencer Vulns
critical 9.3

CVE-2001-0537 in the critical feed json

HTTP server for Cisco IOS 11.3 to 12.2 allows attackers to bypass authentication and execute arbitrary commands, when local authorization i…

published 2001-07-21 25 y ago modified 2026-06-16 4 mo ago also EUVD-2001-0529

cvss
9.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
68.5%
EPSS 68.5% chance of exploitation in 30 days, percentile 99.3%
public exploits
5
Metasploit, Exploit-DB, plus a Nuclei check

Summary

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.

Patch / fix

Timeline

  1. First public exploit (EDB-20977)
  2. Published

Exploit prediction

68.45% chance of exploitation in the next 30 days, higher than 99.3% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit auxiliary/scanner/http/cisco_ios_auth_bypass Cisco IOS HTTP Unauthorized Administrative Access metasploit auxiliary, normal rank, 2001-06-27
  • EDB-20978 Cisco IOS 11.x/12.x - HTTP Configuration Arbitrary Administrative Access (4) remote, 2001-06-27
  • EDB-20977 Cisco IOS 11.x/12.x - HTTP Configuration Arbitrary Administrative Access (3) remote, 2001-03-07
  • EDB-20976 Cisco IOS 11.x/12.x - HTTP Configuration Arbitrary Administrative Access (2) remote, 2001-06-27
  • EDB-20975 Cisco IOS 11.x/12.x - HTTP Configuration Arbitrary Administrative Access (1) remote, 2001-06-27
  • Nuclei template Cisco IOS HTTP Configuration - Authentication Bypass nuclei detection template
  • cisco.com http://www.cisco.com/warp/public/707/IOS-httplevel-pub.html referenced PoC, tagged "exploit" by a source, unverified
  • cert.org http://www.cert.org/advisories/CA-2001-14.html referenced PoC, tagged "exploit" by a source, unverified
  • securityfocus.com http://www.securityfocus.com/bid/2936 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.