CVE-2023-20049

HIGHNVD 8.67.5▼
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2023-03-10. NVD baseline CVSS 8.6; sources differ by 1.1.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.6Exploit: NoneExposed: 0

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

A vulnerability in the bidirectional forwarding detection (BFD) hardware offload feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause a line card to reset, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of malformed BFD packets that are received on line cards where the BFD hardware offload feature is enabled. An attacker could exploit this vulnerability by sending a crafted IPv4 BFD packet to an affected device. A successful exploit could allow the attacker to cause line card exceptions or a hard reset, resulting in loss of traffic over that line card while the line card reloads.

CVSS v3
8.6
EG Score
7.5(medium)
EPSS
60.1%
KEV
Not listed

Published

March 9, 2023

Last Modified

November 21, 2024

References (2)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 44× 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. 2026-07-11 08:25 UTCEPSS rescore
  2. 2026-07-11 08:25 UTCEPSS rescore
  3. 2026-07-09 19:08 UTCEPSS rescore
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  10. 2026-07-04 06:29 UTCEPSS rescore
  11. 2026-07-04 06:29 UTCEPSS rescore
  12. 2026-07-02 16:58 UTCEPSS rescore
  13. 2026-07-01 15:04 UTCEPSS rescore
  14. 2026-06-30 23:21 UTCEPSS rescore
  15. 2026-06-28 14:06 UTCEPSS rescore
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  17. 2026-06-28 04:54 UTCEPSS rescore
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  19. 2026-06-27 03:07 UTCEPSS rescore
  20. 2026-06-25 13:48 UTCEPSS rescore
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  24. 2026-06-23 21:31 UTCEPSS rescore
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  1. 2026-06-22 14:24 UTCEPSS rescore
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  3. 2026-06-21 14:55 UTCEPSS rescore
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  5. 2026-06-21 01:58 UTCEPSS rescore
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  7. 2026-06-19 19:24 UTCEPSS rescore
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  9. 2026-06-18 17:51 UTCEPSS rescore
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  11. 2026-06-17 17:51 UTCEPSS rescore
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  17. 2026-06-14 23:16 UTCEPSS rescore
  18. 2026-06-13 22:59 UTCEPSS rescore
  19. 2026-06-12 23:10 UTCEPSS rescore
  20. 2026-06-11 13:59 UTCEPSS rescore
  21. 2026-06-11 13:58 UTCEPSS rescore
  22. 2026-06-10 22:17 UTCEPSS rescore
  23. 2026-06-10 13:21 UTCEPSS rescore
  24. 2026-06-10 13:21 UTCEPSS rescore
  25. 2026-06-08 14:15 UTCEPSS rescore
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  27. 2026-06-07 15:23 UTCEPSS rescore
  28. 2026-06-07 15:23 UTCEPSS rescore
  29. 2026-06-06 13:46 UTCEPSS rescore
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  31. 2026-06-05 22:46 UTCEPSS rescore
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  36. 2026-06-04 13:11 UTCEPSS rescore
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  38. 2026-06-02 20:12 UTCEPSS rescore
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  40. 2026-06-02 20:12 UTCEPSS rescore
  41. 2026-06-01 13:51 UTCEPSS rescore
  42. 2026-06-01 13:50 UTCEPSS rescore
  43. 2026-05-31 22:29 UTCEPSS rescore
  44. 2026-05-31 22:29 UTCEPSS rescore
  45. 2026-05-31 22:29 UTCEPSS rescore
  46. 2026-05-31 00:15 UTCEPSS rescore
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  48. 2026-05-29 13:43 UTCEPSS rescore
  49. 2026-05-29 13:43 UTCEPSS rescore
  50. 2026-05-28 13:43 UTCEPSS rescore
  51. 2026-05-28 13:43 UTCEPSS rescore
  52. 2026-05-27 13:39 UTCEPSS rescore
  53. 2026-05-26 13:43 UTCEPSS rescore
  54. 2026-05-26 13:43 UTCEPSS rescore
  55. 2026-05-26 07:18 UTCEPSS rescore
  56. 2026-05-26 07:17 UTCEPSS rescore
  57. 2026-05-26 07:17 UTCEPSS rescore
  58. 2026-05-25 05:31 UTCEG score recompute
  59. 2026-05-25 05:31 UTCGHSA enrichment
  60. 2026-05-23 21:35 UTCOSV refresh

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Frequently asked(5)

What is CVE-2023-20049?
CVE-2023-20049 is a high vulnerability published on March 9, 2023. A vulnerability in the bidirectional forwarding detection (BFD) hardware offload feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers could allow an unauthenticated, remote…
When was CVE-2023-20049 disclosed?
CVE-2023-20049 was first published in the National Vulnerability Database on March 9, 2023, 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-2023-20049 actively exploited?
CVE-2023-20049 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 60.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-20049?
CVE-2023-20049 has a CVSS v3 base score of 8.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.5.
How do I remediate CVE-2023-20049?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-20049, 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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