CVE-2020-3569

CRITICALNVD 8.69.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.6 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 3%CVSS: 8.6Exploit: cisa kev · ssvc activeExposed: 0

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

Multiple vulnerabilities in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to either immediately crash the Internet Group Management Protocol (IGMP) process or make it consume available memory and eventually crash. The memory consumption may negatively impact other processes that are running on the device. These vulnerabilities are due to the incorrect handling of IGMP packets. An attacker could exploit these vulnerabilities by sending crafted IGMP traffic to an affected device. A successful exploit could allow the attacker to immediately crash the IGMP process or cause memory exhaustion, resulting in other processes becoming unstable. These processes may include, but are not limited to, interior and exterior routing protocols. Cisco will release software updates that address these vulnerabilities.

CVSS v3
8.6
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 PROB
3%
EPSS %ILE
88%
KEV
⚠ Exploited

Published

September 23, 2020

Last Modified

October 28, 2025

Advisory Details (2)

Auto-updated Jun 2, 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-2020-3569
generic🔴 Active Exploitation

Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-dvmrp-memexh-dSmpdvfz

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 56× in last 7d / 243× 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 882 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2020-3569?
CVE-2020-3569 is a critical vulnerability published on September 23, 2020. Multiple vulnerabilities in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to either immediately crash the Internet Group Management Protocol (IGMP) process or make it consume available memory and eventually…
When was CVE-2020-3569 disclosed?
CVE-2020-3569 was first published in the National Vulnerability Database on September 23, 2020, 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-2020-3569 actively exploited?
Yes. CISA added CVE-2020-3569 to the Known Exploited Vulnerabilities catalog on November 3, 2021, 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-2020-3569?
CVE-2020-3569 has a CVSS v3 base score of 8.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2020-3569?
CVE-2020-3569 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-2020-3569?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-3569, 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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