CVE-2024-20456

MEDIUMNVD 6.76.7—
EchelonGraph scoreMEDIUM confidence

Score 6.7 from GitHub Security Advisory published 2024-07-10. NVD baseline CVSS 6.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.7Exploit: NoneExposed: 0

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

A vulnerability in the boot process of Cisco IOS XR Software could allow an authenticated, local attacker with high privileges to bypass the Cisco Secure Boot functionality and load unverified software on an affected device. To exploit this successfully, the attacker must have root-system privileges on the affected device. This vulnerability is due to an error in the software build process. An attacker could exploit this vulnerability by manipulating the system’s configuration options to bypass some of the integrity checks that are performed during the booting process. A successful exploit could allow the attacker to control the boot configuration, which could enable them to bypass of the requirement to run Cisco signed images or alter the security properties of the running system.

CVSS v3
6.7
EG Score
6.7(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: 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
Severity67% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
9.0%
KEV
Not listed

Published

July 10, 2024

Last Modified

August 4, 2025

References (2)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 46× 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. 2026-07-24 14:16 UTCEPSS rescore
  2. 2026-07-23 14:17 UTCEPSS rescore
  3. 2026-07-23 14:17 UTCEPSS rescore
  4. 2026-07-23 02:33 UTCEG score recompute
  5. 2026-07-22 23:19 UTCEG score recompute
  6. 2026-07-22 14:07 UTCEPSS rescore
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  1. 2026-07-09 19:09 UTCEPSS rescore
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  3. 2026-07-07 13:45 UTCEPSS rescore
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  44. 2026-06-12 23:11 UTCEPSS rescore
  45. 2026-06-11 13:59 UTCEPSS rescore
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  47. 2026-06-10 22:17 UTCEPSS rescore
  48. 2026-06-08 14:16 UTCEPSS rescore
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  54. 2026-06-04 13:11 UTCEPSS rescore
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  68. 2026-05-26 07:18 UTCEPSS rescore
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  70. 2026-05-26 07:18 UTCEPSS rescore
  71. 2026-05-23 22:31 UTCEG score recompute
  72. 2026-05-23 22:31 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2024-20456?
CVE-2024-20456 is a medium vulnerability published on July 10, 2024. A vulnerability in the boot process of Cisco IOS XR Software could allow an authenticated, local attacker with high privileges to bypass the Cisco Secure Boot functionality and load unverified software on an affected device. To exploit this successfully, the attacker must have root-system…
When was CVE-2024-20456 disclosed?
CVE-2024-20456 was first published in the National Vulnerability Database on July 10, 2024, with the most recent update on August 4, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-20456 actively exploited?
CVE-2024-20456 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-20456?
CVE-2024-20456 has a CVSS v3 base score of 6.7 (NVD).
How do I remediate CVE-2024-20456?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-20456, 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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