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CVE-2024-20397Cisco NX-OS Software Image Verification Bypass Vulnerability

Description

A vulnerability in the bootloader of Cisco NX-OS Software could allow an unauthenticated attacker with physical access to an affected device, or an authenticated, local attacker with administrative credentials, to bypass NX-OS image signature verification.  This vulnerability is due to insecure bootloader settings. An attacker could exploit this vulnerability by executing a series of bootloader commands. A successful exploit could allow the attacker to bypass NX-OS image signature verification and load unverified software.

Timeline

  1. ID reserved

    By cisco

  2. · 13 months later

    Published

  3. · 4 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2024-20397, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Medium5.2CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
NVDNVD · Deferred3.1Medium5.2CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
EPSS (exploitation in 30 days)
0.30% · top 77% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.2.

Affected products

  • Cisco · Cisco NX-OS Software

    • affected 8.2(5)
    • affected 7.3(5)D1(1)
    • affected 8.4(2)
    • affected 8.4(3)
    • affected 9.2(3)
    • affected 7.0(3)I5(2)
    • affected 8.2(1)
    • affected 6.0(2)A8(7a)
    • affected 7.0(3)I4(5)
    • affected 7.3(1)D1(1)
    • affected 7.0(3)I4(6)
    • affected 7.0(3)I4(3)
    • affected 9.2(2v)
    • affected 7.3(0)D1(1)
    • affected 7.0(3)I4(7)
    • affected 7.0(3)I4(1)
    • affected 7.0(3)I4(8)
    • affected 7.0(3)I4(2)
    • affected 6.0(2)A8(11)
    • affected 7.3(4)D1(1)
    • affected 9.2(1)
    • affected 9.2(2t)
    • affected 9.2(3y)
    • affected 7.0(3)I4(1t)
    • affected 7.0(3)I7(6z)
    • affected 9.3(2)
    • affected 7.3(1)DY(1)
    • affected 7.0(3)F3(3)
    • affected 7.0(3)I7(3z)
    • affected 7.0(3)IM7(2)
    • affected 6.0(2)A8(11b)
    • affected 7.0(3)I7(5a)
    • affected 8.1(1)
    • affected 7.0(3)I6(1)
    • affected 8.2(2)
    • affected 7.0(3)I5(3b)
    • affected 8.3(2)
    • affected 7.3(2)D1(3a)
    • affected 9.2(4)
    • affected 6.0(2)A8(10)
    • and 145 more

  • Cisco · Cisco NX-OS System Software in ACI Mode

    • affected 14.1(1j)
    • affected 14.0(3d)
    • affected 14.1(1k)
    • affected 13.2(1m)
    • affected 14.0(3c)
    • affected 13.2(2l)
    • affected 13.2(7k)
    • affected 14.1(1l)
    • affected 14.2(2f)
    • affected 13.2(3s)
    • affected 13.2(2o)
    • affected 14.0(2c)
    • affected 14.1(2m)
    • affected 13.2(5e)
    • affected 14.1(2o)
    • affected 13.2(7f)
    • affected 13.2(41d)
    • affected 13.2(4d)
    • affected 13.2(3o)
    • affected 13.2(1l)
    • affected 14.0(1h)
    • affected 13.2(3n)
    • affected 14.2(1l)
    • affected 14.2(2e)
    • affected 13.2(4e)
    • affected 14.2(1i)
    • affected 13.2(9b)
    • affected 14.1(2s)
    • affected 14.1(1i)
    • affected 14.1(2g)
    • affected 13.2(3j)
    • affected 13.2(5d)
    • affected 13.2(6i)
    • affected 14.1(2u)
    • affected 13.2(3i)
    • affected 13.2(3r)
    • affected 13.2(5f)
    • affected 14.2(1j)
    • affected 14.1(2w)
    • affected 14.2(3n)
    • and 85 more

  • Cisco · Cisco Unified Computing System (Managed)

    • affected 4.0(4c)
    • affected 4.0(2b)
    • affected 4.1(2a)
    • affected 4.0(1a)
    • affected 4.0(2a)
    • affected 4.0(1b)
    • affected 4.1(1c)
    • affected 4.0(4a)
    • affected 4.0(4b)
    • affected 4.0(2e)
    • affected 4.1(1a)
    • affected 4.0(4d)
    • affected 4.0(4h)
    • affected 4.0(4g)
    • affected 4.0(1d)
    • affected 4.1(1e)
    • affected 4.0(4f)
    • affected 4.0(4e)
    • affected 4.0(4i)
    • affected 4.1(1d)
    • affected 4.0(2d)
    • affected 4.1(1b)
    • affected 4.0(1c)
    • affected 4.1(2b)
    • affected 4.0(4k)
    • affected 4.1(3a)
    • affected 4.1(3b)
    • affected 4.1(2c)
    • affected 4.0(4l)
    • affected 4.1(4a)
    • affected 4.1(3c)
    • affected 4.1(3d)
    • affected 4.2(1c)
    • affected 4.2(1d)
    • affected 4.0(4m)
    • affected 4.1(3e)
    • affected 4.2(1f)
    • affected 4.1(3f)
    • affected 4.2(1i)
    • affected 4.1(3h)
    • and 31 more

What to do

Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2024-20397 badge
[![CVE-2024-20397](https://cveledger.app/badge/CVE-2024-20397.svg)](https://cveledger.app/cve/CVE-2024-20397)

Record last updated .