CVE-2024-20266

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2024-03-13. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: None knownExposed: 0

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

A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition. This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a crash of the dhcpd process. While the dhcpd process is restarting, which may take approximately two minutes, DHCPv4 server services are unavailable on the affected device. This could temporarily prevent network access to clients that join the network during that time period and rely on the DHCPv4 server of the affected device. Notes: Only the dhcpd process crashes and eventually restarts automatically. The router does not reload. This vulnerability only applies to DHCPv4. DHCP version 6 (DHCPv6) is not affected.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

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
Severity53% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

March 13, 2024

Last Modified

April 15, 2026

References (2)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 42× 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 129 total refreshes for this CVE.

  1. 2026-07-28 15:34 UTCEPSS rescore
  2. 2026-07-27 14:11 UTCEPSS rescore
  3. 2026-07-26 14:53 UTCEPSS rescore
  4. 2026-07-26 14:53 UTCEPSS rescore
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  7. 2026-07-23 14:17 UTCEPSS rescore
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  9. 2026-07-23 02:33 UTCEG score recompute
  10. 2026-07-22 23:19 UTCEG score recompute
  11. 2026-07-22 14:07 UTCEPSS rescore
  12. 2026-07-21 15:23 UTCEPSS rescore
  13. 2026-07-20 17:06 UTCEPSS rescore
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  1. 2026-07-12 05:45 UTCEPSS rescore
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  20. 2026-06-28 04:55 UTCEPSS rescore
  21. 2026-06-27 03:07 UTCEPSS rescore
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  23. 2026-06-25 13:48 UTCEPSS rescore
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  26. 2026-06-23 21:32 UTCEPSS rescore
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  42. 2026-06-14 23:16 UTCEPSS rescore
  43. 2026-06-13 22:59 UTCEPSS rescore
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  45. 2026-06-12 23:11 UTCEPSS rescore
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  47. 2026-06-11 13:59 UTCEPSS rescore
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  49. 2026-06-10 22:17 UTCEPSS rescore
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  51. 2026-06-10 13:21 UTCEPSS rescore
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  55. 2026-06-07 15:24 UTCEPSS rescore
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  57. 2026-06-06 13:46 UTCEPSS rescore
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  61. 2026-06-05 06:09 UTCEPSS rescore
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  63. 2026-06-04 13:11 UTCEPSS rescore
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  70. 2026-05-31 22:30 UTCEPSS rescore
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  72. 2026-05-31 00:15 UTCEPSS rescore
  73. 2026-05-31 00:15 UTCEPSS rescore
  74. 2026-05-29 13:43 UTCEPSS rescore
  75. 2026-05-28 13:44 UTCEPSS rescore

Frequently asked(5)

What is CVE-2024-20266?
CVE-2024-20266 is a medium vulnerability published on March 13, 2024. A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition. This vulnerability exists because certain DHCPv4 messages are improperly…
When was CVE-2024-20266 disclosed?
CVE-2024-20266 was first published in the National Vulnerability Database on March 13, 2024, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-20266 actively exploited?
CVE-2024-20266 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.0% of all scored CVEs.
What is the CVSS score of CVE-2024-20266?
CVE-2024-20266 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2024-20266?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-20266, 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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