Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2024-20397

20
FAUCET Score

CVE-2024-20397 is a bootloader vulnerability in Cisco NX-OS Software that allows an unauthenticated attacker with physical access, or an authenticated local administrator, to bypass image signature verification. This medium-severity vulnerability (CVSS 5.2) is due to insecure bootloader settings, enabling an attacker to load unverified software. While no public exploit code or active exploitation is reported, the vulnerability has garnered community attention and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
CiscoCisco NX-OS Software
10.1(1), 10.1(2), 10.1(2t), 10.2(1), 10.2(1q), 10.2(2), 10.2(2a), 10.2(3), 10.2(3t), 10.2(3v), 10.2(4), 10.2(5), 10.2(6), 10.2(7), 10.2(8), 10.3(1), 10.3(2), 10.3(3), 10.3(3o), 10.3(3p), 10.3(3q), 10.3(3r), 10.3(3w), 10.3(3x), 10.3(4), 10.3(4a), 10.3(4g), 10.3(4h), 10.3(5), 10.3(6), 10.3(99w), 10.3(99x), 10.4(1), 10.4(2), 10.4(3), 10.4(4), 10.4(4g), 10.5(1), 6.0(2)A8(1), 6.0(2)A8(10), 6.0(2)A8(10a), 6.0(2)A8(11), 6.0(2)A8(11a), 6.0(2)A8(11b), 6.0(2)A8(2), 6.0(2)A8(3), 6.0(2)A8(4), 6.0(2)A8(4a), 6.0(2)A8(5), 6.0(2)A8(6), 6.0(2)A8(7), 6.0(2)A8(7a), 6.0(2)A8(7b), 6.0(2)A8(8), 6.0(2)A8(9), 7.0(3)F3(1), 7.0(3)F3(2), 7.0(3)F3(3), 7.0(3)F3(3a), 7.0(3)F3(3c), 7.0(3)F3(4), 7.0(3)F3(5), 7.0(3)I4(1), 7.0(3)I4(1t), 7.0(3)I4(2), 7.0(3)I4(3), 7.0(3)I4(4), 7.0(3)I4(5), 7.0(3)I4(6), 7.0(3)I4(6t), 7.0(3)I4(7), 7.0(3)I4(8), 7.0(3)I4(8a), 7.0(3)I4(8b), 7.0(3)I4(8z), 7.0(3)I4(9), 7.0(3)I5(1), 7.0(3)I5(2), 7.0(3)I5(3), 7.0(3)I5(3a), 7.0(3)I5(3b), 7.0(3)I6(1), 7.0(3)I6(2), 7.0(3)I7(1), 7.0(3)I7(10), 7.0(3)I7(2), 7.0(3)I7(3), 7.0(3)I7(3z), 7.0(3)I7(4), 7.0(3)I7(5), 7.0(3)I7(5a), 7.0(3)I7(6), 7.0(3)I7(6z), 7.0(3)I7(7), 7.0(3)I7(8), 7.0(3)I7(9), 7.0(3)I7(9w), 7.0(3)IA7(1), 7.0(3)IA7(2), 7.0(3)IC4(4), 7.0(3)IM7(2), 7.3(0)D1(1), 7.3(0)DX(1), 7.3(0)DY(1), 7.3(1)D1(1), 7.3(1)DY(1), 7.3(2)D1(1), 7.3(2)D1(1d), 7.3(2)D1(2), 7.3(2)D1(3), 7.3(2)D1(3a), 7.3(3)D1(1), 7.3(4)D1(1), 7.3(5)D1(1), 7.3(6)D1(1), 7.3(7)D1(1), 7.3(8)D1(1), 7.3(9)D1(1), 8.1(1), 8.1(1a), 8.1(1b), 8.1(2), 8.1(2a), 8.2(1), 8.2(10), 8.2(11), 8.2(2), 8.2(3), 8.2(4), 8.2(5), 8.2(6), 8.2(7), 8.2(7a), 8.2(8), 8.2(9), 8.3(1), 8.3(2), 8.4(1), 8.4(1a), 8.4(2), 8.4(2a), 8.4(2b), 8.4(2c), 8.4(2d), 8.4(2e), 8.4(2f), 8.4(3), 8.4(4), 8.4(4a), 8.4(5), 8.4(6), 8.4(6a), 8.4(7), 8.4(8), 8.4(9), 8.5(1), 9.2(1), 9.2(1a), 9.2(2), 9.2(2t), 9.2(2v), 9.2(3), 9.2(3y), 9.2(4), 9.3(1), 9.3(10), 9.3(11), 9.3(12), 9.3(13), 9.3(14), 9.3(1z), 9.3(2), 9.3(2a), 9.3(3), 9.3(4), 9.3(5), 9.3(5w), 9.3(6), 9.3(7), 9.3(7a), 9.3(7k), 9.3(8), 9.3(9), 9.4(1), 9.4(1a)CNA affecteddefault unknown
CiscoCisco NX-OS System Software In ACI Mode
13.2(10e), 13.2(10f), 13.2(10g), 13.2(1l), 13.2(1m), 13.2(2l), 13.2(2o), 13.2(3i), 13.2(3j), 13.2(3n), 13.2(3o), 13.2(3r), 13.2(3s), 13.2(41d), 13.2(4d), 13.2(4e), 13.2(5d), 13.2(5e), 13.2(5f), 13.2(6i), 13.2(7f), 13.2(7k), 13.2(8d), 13.2(9b), 13.2(9f), 13.2(9h), 14.0(1h), 14.0(2c), 14.0(3c), 14.0(3d), 14.1(1i), 14.1(1j), 14.1(1k), 14.1(1l), 14.1(2g), 14.1(2m), 14.1(2o), 14.1(2s), 14.1(2u), 14.1(2w), 14.1(2x), 14.2(1i), 14.2(1j), 14.2(1l), 14.2(2e), 14.2(2f), 14.2(2g), 14.2(3j), 14.2(3l), 14.2(3n), 14.2(3q), 14.2(4i), 14.2(4k), 14.2(4o), 14.2(4p), 14.2(5k), 14.2(5l), 14.2(5n), 14.2(6d), 14.2(6g), 14.2(6h), 14.2(6l), 14.2(6o), 14.2(7f), 14.2(7l), 14.2(7q), 14.2(7r), 14.2(7s), 14.2(7t), 14.2(7u), 14.2(7v), 14.2(7w), 15.0(1k), 15.0(1l), 15.0(2e), 15.0(2h), 15.1(1h), 15.1(2e), 15.1(3e), 15.1(4c), 15.2(1g), 15.2(2e), 15.2(2f), 15.2(2g), 15.2(2h), 15.2(3e), 15.2(3f), 15.2(3g), 15.2(4d), 15.2(4e), 15.2(4f), 15.2(5c), 15.2(5d), 15.2(5e), 15.2(6e), 15.2(6g), 15.2(6h), 15.2(7f), 15.2(7g), 15.2(8d), 15.2(8e), 15.2(8f), 15.2(8g), 15.2(8h), 15.2(8i), 15.3(1d), 15.3(2a), 15.3(2b), 15.3(2c), 15.3(2d), 15.3(2e), 16.0(1g), 16.0(1j), 16.0(2h), 16.0(2j), 16.0(3d), 16.0(3e), 16.0(3g), 16.0(4c), 16.0(5h), 16.0(5j), 16.0(6c), 16.0(7e), 16.0(8e), 16.1(1f)CNA affecteddefault unknown
CiscoCisco Unified Computing System (Managed)
4.0(1a), 4.0(1b), 4.0(1c), 4.0(1d), 4.0(2a), 4.0(2b), 4.0(2d), 4.0(2e), 4.0(4a), 4.0(4b), 4.0(4c), 4.0(4d), 4.0(4e), 4.0(4f), 4.0(4g), 4.0(4h), 4.0(4i), 4.0(4k), 4.0(4l), 4.0(4m), 4.0(4n), 4.0(4o), 4.1(1a), 4.1(1b), 4.1(1c), 4.1(1d), 4.1(1e), 4.1(2a), 4.1(2b), 4.1(2c), 4.1(3a), 4.1(3b), 4.1(3c), 4.1(3d), 4.1(3e), 4.1(3f), 4.1(3h), 4.1(3i), 4.1(3j), 4.1(3k), 4.1(3l), 4.1(3m), 4.1(4a), 4.2(1c), 4.2(1d), 4.2(1f), 4.2(1i), 4.2(1k), 4.2(1l), 4.2(1m), 4.2(1n), 4.2(2a), 4.2(2c), 4.2(2d), 4.2(2e), 4.2(3b), 4.2(3d), 4.2(3e), 4.2(3g), 4.2(3h), 4.2(3i), 4.2(3j), 4.2(3k), 4.2(3l), 4.2(3m), 4.3(2b), 4.3(2c), 4.3(2e), 4.3(2f), 4.3(3a), 4.3(3c)CNA affecteddefault unknown

CVSS Data

CVSS version used by this source: 3.1

5.2MEDIUM

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Attack Vector
PHYSICAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
0.9
Impact Score
4.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.30%
Probability of exploitation in next 30 days
EPSS Percentile
22.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0030 is in the 47th percentile among its peer group of 1,532 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

sec.cloudapps.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-image-sig-bypas-pQDRQvjL