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Fencer Vulns
critical 9.8

CVE-2021-34746 in the critical feed json

Cisco Enterprise NFV Infrastructure Software Authentication Bypass Vulnerability

published 2021-09-02 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21396

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
17.7%
EPSS 17.7% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

A vulnerability in the TACACS+ authentication, authorization and accounting (AAA) feature of Cisco Enterprise NFV Infrastructure Software (NFVIS) could allow an unauthenticated, remote attacker to bypass authentication and log in to an affected device as an administrator. This vulnerability is due to incomplete validation of user-supplied input that is passed to an authentication script. An attacker could exploit this vulnerability by injecting parameters into an authentication request. A successful exploit could allow the attacker to bypass authentication and log in as an administrator to the affected device.

Patch / fix

  • cisco enterprise_nfv_infrastructure_software 4.6.1

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

17.66% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/orangecertcc/security-research/security/advisories/GHSA-gqx8-c4xr-c664 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

  • Cisco Cisco Enterprise NFV Infrastructure Software

Classification

Weakness
  • CWE-289 Authentication Bypass by Alternate Name
  • CWE-287 Improper Authentication

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.