CVE-2021-34746

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 18%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
—
EPSS
96.8%
KEV
Not listed

Published

September 2, 2021

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jun 8, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic🟡 PoC Available

Cisco Enterprise NFV Infrastructure Software Authentication Bypass Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nfvis-g2DMVVh
github Patch Available

Cisco ENCS - Authentication Bypass (CVE-2021-34746) · Advisory · orangecertcc/security-research · GitHub

https://github.com/orangecertcc/security-research/security/advisories/GHSA-gqx8-c4xr-c664

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:48 UTCEG score recompute
  2. 2026-07-22 14:06 UTCEPSS rescore
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  4. 2026-07-21 15:22 UTCEPSS rescore
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  1. 2026-07-05 02:28 UTCEPSS rescore
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  3. 2026-06-30 23:20 UTCEPSS rescore
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  18. 2026-06-21 14:55 UTCEPSS rescore
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  41. 2026-06-06 13:46 UTCEPSS rescore
  42. 2026-06-06 13:46 UTCEPSS rescore
  43. 2026-06-06 13:46 UTCEPSS rescore
  44. 2026-06-05 22:45 UTCEPSS rescore
  45. 2026-06-05 06:09 UTCEPSS rescore
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  47. 2026-06-04 13:10 UTCEPSS rescore
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  49. 2026-06-02 20:11 UTCEPSS rescore
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  51. 2026-06-01 13:50 UTCEPSS rescore
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  55. 2026-05-31 00:15 UTCEPSS rescore
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  57. 2026-05-29 13:42 UTCEPSS rescore
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  61. 2026-05-27 13:39 UTCEPSS rescore
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  64. 2026-05-26 13:42 UTCEPSS rescore
  65. 2026-05-26 11:07 UTCEG score recompute
  66. 2026-05-26 11:07 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2021-34746?
CVE-2021-34746 is a critical vulnerability published on September 2, 2021. 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…
When was CVE-2021-34746 disclosed?
CVE-2021-34746 was first published in the National Vulnerability Database on September 2, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-34746 actively exploited?
CVE-2021-34746 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 96.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-34746?
CVE-2021-34746 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-34746?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-34746, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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