CVE-2022-20821

MEDIUMNVD 6.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.5 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
6.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 12%CVSS: 6.5Exploit: NoneExposed: 0

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

A vulnerability in the health check RPM of Cisco IOS XR Software could allow an unauthenticated, remote attacker to access the Redis instance that is running within the NOSi container. This vulnerability exists because the health check RPM opens TCP port 6379 by default upon activation. An attacker could exploit this vulnerability by connecting to the Redis instance on the open port. A successful exploit could allow the attacker to write to the Redis in-memory database, write arbitrary files to the container filesystem, and retrieve information about the Redis database. Given the configuration of the sandboxed container that the Redis instance runs in, a remote attacker would be unable to execute remote code or abuse the integrity of the Cisco IOS XR Software host system.

CVSS v3
6.5
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
95.6%
KEV
⚠ Exploited

Published

May 26, 2022

Last Modified

October 28, 2025

Advisory Details (2)

Auto-updated Jun 13, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-20821
generic🔴 Active Exploitation

Cisco IOS XR Software Health Check Open Port Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-redis-ABJyE5xK

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 47× in last 7d / 238× 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.

Showing the most recent 100 of 468 total refreshes for this CVE.

  1. 2026-07-24 14:15 UTCEPSS rescore
  2. 2026-07-24 14:15 UTCEPSS rescore
  3. 2026-07-23 14:16 UTCEPSS rescore
  4. 2026-07-23 02:07 UTCEG score recompute
  5. 2026-07-22 22:23 UTCEG score recompute
  6. 2026-07-22 22:23 UTCGHSA enrichment
  7. 2026-07-22 19:40 UTCCISA KEV update
  8. 2026-07-22 18:37 UTCGHSA enrichment
  9. 2026-07-22 14:52 UTCEG score recompute
  10. 2026-07-22 14:52 UTCGHSA enrichment
  11. 2026-07-22 14:06 UTCEPSS rescore
  12. 2026-07-22 11:04 UTCGHSA enrichment
  13. 2026-07-22 07:20 UTCGHSA enrichment
  14. 2026-07-22 03:36 UTCGHSA enrichment
  15. 2026-07-21 23:52 UTCGHSA enrichment
  16. 2026-07-21 20:07 UTCGHSA enrichment
  17. 2026-07-21 16:23 UTCEG score recompute
  18. 2026-07-21 16:23 UTCGHSA enrichment
  19. 2026-07-21 15:22 UTCEPSS rescore
  20. 2026-07-21 15:22 UTCEPSS rescore
  21. 2026-07-21 14:37 UTCCISA KEV update
  22. 2026-07-21 12:39 UTCGHSA enrichment
  23. 2026-07-21 08:55 UTCGHSA enrichment
  24. 2026-07-21 05:10 UTCGHSA enrichment
  25. 2026-07-21 01:26 UTCGHSA enrichment
Show 75 more
  1. 2026-07-20 21:42 UTCGHSA enrichment
  2. 2026-07-20 17:57 UTCEG score recompute
  3. 2026-07-20 17:57 UTCGHSA enrichment
  4. 2026-07-20 17:05 UTCEPSS rescore
  5. 2026-07-20 14:12 UTCGHSA enrichment
  6. 2026-07-20 10:28 UTCGHSA enrichment
  7. 2026-07-20 06:44 UTCGHSA enrichment
  8. 2026-07-20 02:48 UTCGHSA enrichment
  9. 2026-07-19 23:03 UTCGHSA enrichment
  10. 2026-07-19 19:17 UTCGHSA enrichment
  11. 2026-07-19 15:33 UTCEG score recompute
  12. 2026-07-19 15:33 UTCGHSA enrichment
  13. 2026-07-19 14:29 UTCEPSS rescore
  14. 2026-07-19 11:49 UTCGHSA enrichment
  15. 2026-07-19 08:05 UTCGHSA enrichment
  16. 2026-07-19 04:21 UTCEG score recompute
  17. 2026-07-19 04:21 UTCGHSA enrichment
  18. 2026-07-19 02:27 UTCEPSS rescore
  19. 2026-07-19 02:27 UTCEPSS rescore
  20. 2026-07-19 00:36 UTCGHSA enrichment
  21. 2026-07-18 20:52 UTCGHSA enrichment
  22. 2026-07-18 17:08 UTCGHSA enrichment
  23. 2026-07-18 13:24 UTCEG score recompute
  24. 2026-07-18 13:24 UTCGHSA enrichment
  25. 2026-07-18 10:02 UTCEPSS rescore
  26. 2026-07-18 09:40 UTCGHSA enrichment
  27. 2026-07-18 05:56 UTCGHSA enrichment
  28. 2026-07-18 02:11 UTCGHSA enrichment
  29. 2026-07-17 22:28 UTCGHSA enrichment
  30. 2026-07-17 18:44 UTCGHSA enrichment
  31. 2026-07-17 15:00 UTCGHSA enrichment
  32. 2026-07-17 11:16 UTCGHSA enrichment
  33. 2026-07-17 07:31 UTCEG score recompute
  34. 2026-07-17 07:31 UTCGHSA enrichment
  35. 2026-07-17 03:47 UTCGHSA enrichment
  36. 2026-07-17 00:03 UTCGHSA enrichment
  37. 2026-07-16 20:18 UTCGHSA enrichment
  38. 2026-07-16 17:04 UTCCISA KEV update
  39. 2026-07-16 17:00 UTCEPSS rescore
  40. 2026-07-16 17:00 UTCEPSS rescore
  41. 2026-07-16 16:34 UTCGHSA enrichment
  42. 2026-07-16 12:50 UTCGHSA enrichment
  43. 2026-07-16 09:06 UTCGHSA enrichment
  44. 2026-07-16 05:21 UTCGHSA enrichment
  45. 2026-07-16 01:36 UTCGHSA enrichment
  46. 2026-07-15 21:51 UTCGHSA enrichment
  47. 2026-07-15 18:07 UTCGHSA enrichment
  48. 2026-07-15 16:55 UTCEPSS rescore
  49. 2026-07-15 16:49 UTCCISA KEV update
  50. 2026-07-15 15:04 UTCCISA KEV update
  51. 2026-07-15 14:23 UTCGHSA enrichment
  52. 2026-07-15 10:39 UTCGHSA enrichment
  53. 2026-07-15 06:54 UTCGHSA enrichment
  54. 2026-07-15 03:10 UTCGHSA enrichment
  55. 2026-07-15 01:58 UTCEPSS rescore
  56. 2026-07-15 01:58 UTCEPSS rescore
  57. 2026-07-14 23:26 UTCGHSA enrichment
  58. 2026-07-14 19:42 UTCGHSA enrichment
  59. 2026-07-14 18:05 UTCCISA KEV update
  60. 2026-07-14 15:58 UTCGHSA enrichment
  61. 2026-07-14 12:13 UTCGHSA enrichment
  62. 2026-07-14 08:28 UTCGHSA enrichment
  63. 2026-07-14 04:44 UTCGHSA enrichment
  64. 2026-07-14 00:59 UTCGHSA enrichment
  65. 2026-07-13 22:27 UTCEPSS rescore
  66. 2026-07-13 21:15 UTCGHSA enrichment
  67. 2026-07-13 17:31 UTCGHSA enrichment
  68. 2026-07-13 17:07 UTCCISA KEV update
  69. 2026-07-13 13:46 UTCGHSA enrichment
  70. 2026-07-13 10:02 UTCGHSA enrichment
  71. 2026-07-13 06:14 UTCGHSA enrichment
  72. 2026-07-13 06:11 UTCEPSS rescore
  73. 2026-07-13 06:11 UTCEPSS rescore
  74. 2026-07-13 02:30 UTCGHSA enrichment
  75. 2026-07-12 22:44 UTCGHSA enrichment

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Frequently asked(6)

What is CVE-2022-20821?
CVE-2022-20821 is a medium vulnerability published on May 26, 2022. A vulnerability in the health check RPM of Cisco IOS XR Software could allow an unauthenticated, remote attacker to access the Redis instance that is running within the NOSi container. This vulnerability exists because the health check RPM opens TCP port 6379 by default upon activation. An attacker…
When was CVE-2022-20821 disclosed?
CVE-2022-20821 was first published in the National Vulnerability Database on May 26, 2022, with the most recent update on October 28, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-20821 actively exploited?
Yes. CISA added CVE-2022-20821 to the Known Exploited Vulnerabilities catalog on May 23, 2022, affecting Cisco IOS XR. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2022-20821?
CVE-2022-20821 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2022-20821?
CVE-2022-20821 affects Cisco IOS XR. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2022-20821?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-20821, 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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