7.1

CVE-2026-20293: cisco cisco enterprise nfv infrastructure software Exposed Dangerous Method or Function

CVSS: 7.1v3.1HighAwaiting analysis
Published 08-09-2026Last modified 16-09-2026
Open JSON

Vulnerability summary

CVE-2026-20293 is a high (CVSS 7.1) Exposed Dangerous Method or Function vulnerability in cisco cisco enterprise nfv infrastructure software. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.5% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.16%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-09-2026
    PublishedVulnerability first disclosed.
  2. 16-09-2026
    Last modifiedVulnerability information updated.

Description

A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for a user account with the role of user or admin or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software. This vulnerability is due to the availability of memory write commands in the UEFI Shell while UEFI Secure Boot is enabled on a device. An attacker could exploit this vulnerability by selecting the UEFI Shell boot option at boot time and using available shell commands to modify UEFI memory variables. A successful exploit could allow the attacker to manipulate the preboot environment, overwrite UEFI Secure Boot-related memory values, and execute unauthorized software on the affected device.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.03 pp

From 0.13% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco4 products
  • cisco enterprise nfv infrastructure software4.1.1 | 3.9.1 | 3.5.2 | 3.12.2 | 3.6.2 | 3.9.2 | 3.11.3 | 3.11.1 | 3.5.1 | 3.3.1 | 3.10.2 | 3.12.1b | 3.4.1 | 3.12.1a | 3.6.3 | 3.8.1 | 3.11.2 | 3.12.1 | 3.12.3 | 3.10.1 | 3.6.1 | 3.10.3 | 3.7.1 | 4.1.2 | 4.2.1 | 4.2.2 | 4.4.1 | 4.4.2 | 4.5.1 | 4.4.3 | 4.6.1 | 4.7.1 | 4.6.2-FC2 | 4.6.2 | 4.8.1 | 4.8.2 | 4.9.1 | 4.6.3 | 4.9.2 | 4.10.1 | 4.9.3 | 4.11.1 | 4.9.4 | 4.12.1 | 4.6.4 | 4.12.2 | 4.13.1 | 4.9.5 | 4.12.3 | 4.14.1 | 4.6.3-FC4 | 4.9.4-FC3 | 4.12.4 | 4.15.1 | 4.9.6 | 4.15.2 | 4.12.5 | 4.15.3 | 4.15.4 | 4.12.6 | 4.15.5 | 4.12.7 | 4.12.8 | 4.15.6 | 4.9.10
  • cisco unified computing system e-series software (ucse)4.11.1 | 4.12.1 | 4.12.2 | 4.15.2 | 4.15.3 | 4.15.4
  • cisco unified computing system (managed)4.0(1a) | 4.1(1a) | 4.1(1b) | 4.0(4h) | 4.1(1c) | 4.0(4e) | 4.0(4g) | 4.0(2e) | 4.0(4a) | 4.0(2d) | 4.0(1b) | 4.0(4f) | 4.0(4c) | 4.0(1c) | 4.0(4b) | 4.0(2b) | 4.0(4d) | 4.0(2a) | 4.0(1d) | 4.0(4i) | 4.1(1d) | 4.1(2a) | 4.1(1e) | 4.1(2b) | 4.0(4k) | 4.1(3a) | 4.1(3b) | 4.1(2c) | 4.0(4l) | 4.1(4a) | 4.1(3c) | 4.1(3d) | 4.2(1c) | 4.2(1d) | 4.0(4m) | 4.1(3e) | 4.2(1f) | 4.1(3f) | 4.2(1i) | 4.2(1k) | 4.0(4n) | 4.1(3h) | 4.2(1l) | 4.2(1m) | 4.1(3i) | 4.2(2a) | 4.2(1n) | 4.1(3j) | 4.2(2c) | 4.2(2d) | 4.2(3b) | 4.1(3k) | 4.0(4o) | 4.2(2e) | 4.2(3d) | 4.2(3e) | 4.2(3g) | 4.1(3l) | 4.3(2b) | 4.2(3h) | 4.2(3i) | 4.3(2c) | 4.1(3m) | 4.3(2e) | 4.3(3a) | 4.2(3j) | 4.3(3c) | 4.3(4a) | 4.2(3k) | 4.3(4b) | 4.3(4c) | 4.2(3l) | 4.3(4d) | 4.2(3m) | 4.3(2f) | 4.3(5a) | 4.3(4e) | 4.1(3n) | 4.3(4f) | 4.2(3n) | 4.3(5c) | 4.2(3o) | 4.3(5d) | 4.3(6a) | 4.3(6b) | 4.3(5e) | 4.3(6c) | 6.0(1b) | 4.2(3p) | 6.0(1c) | 4.3(6d) | 6.0(1d) | 6.0(1e) | 4.3(6e) | 6.0(1f) | 4.3(6f) | 6.0(2b) | 6.0(1h) | 4.2(3r) | 6.0(2c) | 4.3(6g)
  • cisco unified computing system (standalone)4.0(2g) | 3.1(2i) | 3.1(1d) | 4.0(4i) | 4.1(1c) | 4.0(2c) | 4.0(1e) | 4.0(2h) | 4.0(4h) | 4.0(1h) | 4.0(2l) | 3.1(3g) | 4.0(1.240) | 4.0(2f) | 4.0(1g) | 4.0(2i) | 3.1(3i) | 4.0(4d) | 4.1(1d) | 3.1(3c) | 4.0(4k) | 3.1(2d) | 3.1(3a) | 3.1(3j) | 4.0(2d) | 4.1(1f) | 4.0(4j) | 4.0(2m) | 4.0(2k) | 4.0(1c) | 4.0(4f) | 4.0(4c) | 3.1(3d) | 3.1(2g) | 3.1(2c) | 4.0(1d) | 3.1(2e) | 4.0(1a) | 4.0(1b) | 3.1(3b) | 4.0(4b) | 3.1(2b) | 4.0(4e) | 3.1(3h) | 4.0(4l) | 4.1(1g) | 4.1(2a) | 4.0(2n) | 4.1(1h) | 3.1(3k) | 4.1(2b) | 4.0(2o) | 4.0(4m) | 4.1(2d) | 4.1(3b) | 4.0(2p) | 4.1(2e) | 4.1(2f) | 4.0(4n) | 4.0(2q) | 4.1(3c) | 4.0(2r) | 4.1(3d) | 4.1(2g) | 4.1(2h) | 4.1(3g) | 4.1(3f) | 4.1(2j) | 4.1(2k) | 4.1(3h) | 4.2(2a) | 4.1(3i) | 4.2(2f) | 4.2(2g) | 4.2(3b) | 4.1(3l) | 4.2(3d) | 4.3(1.230097) | 4.2(1e) | 4.2(1b) | 4.2(1j) | 4.2(1i) | 4.2(1f) | 4.2(1a) | 4.2(1c) | 4.2(1g) | 4.3(1.230124) | 4.1(2l) | 4.2(3e) | 4.3(1.230138) | 4.2(3g) | 4.3(2.230207) | 4.2(3h) | 4.2(3i) | 4.3(2.230270) | 4.1(3m) | 4.1(2m) | 4.3(2.240002) | 4.3(3.240022) | 4.2(3j) | 4.1(3n) | 4.3(2.240009) | 4.3(3.240041) | 4.2(3k) | 4.3(3.240043) | 4.3(4.240142) | 4.3(2.240037) | 4.3(2.240053) | 4.3(4.240152) | 4.2(3l) | 4.3(2.240077) | 4.3(4.242028) | 4.3(4.241063) | 4.3(4.242038) | 4.2(3m) | 4.3(2.240090) | 4.3(5.240021) | 4.3(2.240107) | 4.3(4.242066) | 4.2(3n) | 4.3(5.250001) | 4.2(3o) | 4.3(2.250016) | 4.3(2.250021) | 4.3(5.250030) | 4.3(2.250022) | 4.3(6.250039) | 4.3(6.250040) | 4.3(5.250033) | 4.3(6.250044) | 4.3(6.250053) | 4.3(2.250037) | 4.3(2.250045) | 4.3(4.252001) | 4.3(4.252002) | 6.0(1.250127) | 4.2(3p) | 6.0(1.250131) | 4.3(6.250101) | 6.0(1.250174) | 4.3(6.250117) | 4.3(5.250043) | 4.3(5.250045) | 4.3(6.250060) | 6.0(1.250130) | 4.3(4.241014) | 6.0(1.251030) | 4.3(2.250063) | 6.0(1.250192) | 4.3(6.260003) | 6.0(1.250194) | 6.0(1.260001) | 4.3(6.260017) | 4.3(2.260007) | 6.0(2.260044) | 6.0(2.260042) | 4.0(1.260003) | 2.0(2.260062) | 2.0(1.250127) | 2.0(1.250096) | 4.0(1.260004) | 6.0(2.260026) | 6.0(1.251006) | 1.2(0.250011) | 1.1(0.250016) | 1.0(0.240001) | 1.0(0.250003) | 1.2(0.250013) | 1.1(0.250026) | 1.0(1.250002) | 1.1(0.250022) | 1.1(0.250025) | 1.0(1.250032) | 6.0(2.260034) | 6.0(2.260069) | 4.3(6.260033) | 2.0(2.260101) | 4.2(3q) | 4.2(3r) | 1.2(0.260005)

1 vendor · 4 products

References

1 links