CVE-2021-1619

CRITICALNVD 9.89.1▼
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.7.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%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 authentication, authorization, and accounting (AAA) function of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass NETCONF or RESTCONF authentication and do either of the following: Install, manipulate, or delete the configuration of an affected device Cause memory corruption that results in a denial of service (DoS) on an affected device This vulnerability is due to an uninitialized variable. An attacker could exploit this vulnerability by sending a series of NETCONF or RESTCONF requests to an affected device. A successful exploit could allow the attacker to use NETCONF or RESTCONF to install, manipulate, or delete the configuration of a network device or to corrupt memory on the device, resulting a DoS.

CVSS v3
9.8
EG Score
9.1(medium)
EPSS
74.6%
KEV
Not listed

Published

September 23, 2021

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Jun 21, 2026
No patch confirmed yet.
generic

Cisco IOS XE Software NETCONF and RESTCONF Authentication Bypass Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aaa-Yx47ZT8Q

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 49× 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. 2026-07-15 16:55 UTCEPSS rescore
  2. 2026-07-15 16:55 UTCEPSS rescore
  3. 2026-07-15 01:57 UTCEPSS rescore
  4. 2026-07-13 22:27 UTCEPSS rescore
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  11. 2026-07-09 19:07 UTCEPSS rescore
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  14. 2026-07-06 16:25 UTCEPSS rescore
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  21. 2026-07-02 16:57 UTCEPSS rescore
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  1. 2026-06-29 14:04 UTCEPSS rescore
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  3. 2026-06-28 04:54 UTCEPSS rescore
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  5. 2026-06-27 03:06 UTCEPSS rescore
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  7. 2026-06-25 13:48 UTCEPSS rescore
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  9. 2026-06-24 14:03 UTCEPSS rescore
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  11. 2026-06-23 21:31 UTCEPSS rescore
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  17. 2026-06-21 01:58 UTCEPSS rescore
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  19. 2026-06-19 19:24 UTCEPSS rescore
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  21. 2026-06-18 17:51 UTCEPSS rescore
  22. 2026-06-18 17:51 UTCEPSS rescore
  23. 2026-06-17 17:51 UTCEPSS rescore
  24. 2026-06-16 17:50 UTCEPSS rescore
  25. 2026-06-15 17:46 UTCEPSS rescore
  26. 2026-06-14 23:15 UTCEPSS rescore
  27. 2026-06-13 22:58 UTCEPSS rescore
  28. 2026-06-12 23:10 UTCEPSS rescore
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  30. 2026-06-11 13:58 UTCEPSS rescore
  31. 2026-06-10 22:16 UTCEPSS rescore
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  36. 2026-06-07 15:23 UTCEPSS rescore
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  41. 2026-06-05 22:45 UTCEPSS rescore
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  43. 2026-06-05 06:09 UTCEPSS rescore
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  46. 2026-06-04 13:10 UTCEPSS rescore
  47. 2026-06-02 20:11 UTCEPSS rescore
  48. 2026-06-02 20:11 UTCEPSS rescore
  49. 2026-06-01 13:50 UTCEPSS rescore
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  51. 2026-05-31 22:29 UTCEPSS rescore
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  55. 2026-05-29 13:42 UTCEPSS rescore
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  58. 2026-05-27 13:39 UTCEPSS rescore
  59. 2026-05-26 13:42 UTCEPSS rescore
  60. 2026-05-26 13:42 UTCEPSS rescore
  61. 2026-05-26 10:02 UTCEG score recompute
  62. 2026-05-26 10:02 UTCGHSA enrichment
  63. 2026-05-26 07:17 UTCEPSS rescore
  64. 2026-05-26 07:17 UTCEPSS rescore
  65. 2026-05-24 16:49 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-1619?
CVE-2021-1619 is a critical vulnerability published on September 23, 2021. A vulnerability in the authentication, authorization, and accounting (AAA) function of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass NETCONF or RESTCONF authentication and do either of the following: Install, manipulate, or delete the configuration of an affected…
When was CVE-2021-1619 disclosed?
CVE-2021-1619 was first published in the National Vulnerability Database on September 23, 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-2021-1619 actively exploited?
CVE-2021-1619 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 74.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-1619?
CVE-2021-1619 has a CVSS v3 base score of 9.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.1.
How do I remediate CVE-2021-1619?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-1619, 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.

Dependency Blast Radius

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