Answer in brief
CVE-2026-20293 records a Unknown severity vulnerability in Cisco UCS and UCS-Based Appliances UEFI Shell Secure Boot Bypass Vulnerability. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco Enterprise NFV Infrastructure Software (generic), Cisco/Cisco Unified Computing System E-Series Software (UCSE) (generic), Cisco/Cisco Unified Computing System (Managed) (generic), Cisco/Cisco Unified Computing System (Standalone) (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Cisco/Cisco Enterprise NFV Infrastructure Software (generic), Cisco/Cisco Unified Computing System E-Series Software (UCSE) (generic), Cisco/Cisco Unified Computing System (Managed) (generic), Cisco/Cisco Unified Computing System (Standalone) (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco Enterprise NFV Infrastructure Softwaregeneric | 4.1.1 || 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 | Not reported |
| Cisco/Cisco Unified Computing System E-Series Software (UCSE)generic | 4.11.1 || 4.12.1 || 4.12.2 || 4.15.2 || 4.15.3 || 4.15.4 | Not reported |
| Cisco/Cisco Unified Computing System (Managed)generic | 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) | Not reported |
| Cisco/Cisco Unified Computing System (Standalone)generic | 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) | Not reported |
Published upstream
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 8, 2026
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.
Quoted source text, attributed separately from HOL analysis.