CVE-2026-20293 (GCVE-0-2026-20293)
Vulnerability from cvelistv5
Published
2026-09-08 16:04
Modified
2026-09-16 03:57
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-749 - Exposed Dangerous Method or Function
Summary
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.
References
Impacted products
| Vendor | Product | Version | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Enterprise NFV Infrastructure Software |
Version: 4.1.1 Version: 3.9.1 Version: 3.5.2 Version: 3.12.2 Version: 3.6.2 Version: 3.9.2 Version: 3.11.3 Version: 3.11.1 Version: 3.5.1 Version: 3.3.1 Version: 3.10.2 Version: 3.12.1b Version: 3.4.1 Version: 3.12.1a Version: 3.6.3 Version: 3.8.1 Version: 3.11.2 Version: 3.12.1 Version: 3.12.3 Version: 3.10.1 Version: 3.6.1 Version: 3.10.3 Version: 3.7.1 Version: 4.1.2 Version: 4.2.1 Version: 4.2.2 Version: 4.4.1 Version: 4.4.2 Version: 4.5.1 Version: 4.4.3 Version: 4.6.1 Version: 4.7.1 Version: 4.6.2-FC2 Version: 4.6.2 Version: 4.8.1 Version: 4.8.2 Version: 4.9.1 Version: 4.6.3 Version: 4.9.2 Version: 4.10.1 Version: 4.9.3 Version: 4.11.1 Version: 4.9.4 Version: 4.12.1 Version: 4.6.4 Version: 4.12.2 Version: 4.13.1 Version: 4.9.5 Version: 4.12.3 Version: 4.14.1 Version: 4.6.3-FC4 Version: 4.9.4-FC3 Version: 4.12.4 Version: 4.15.1 Version: 4.9.6 Version: 4.15.2 Version: 4.12.5 Version: 4.15.3 Version: 4.15.4 Version: 4.12.6 Version: 4.15.5 Version: 4.12.7 Version: 4.12.8 Version: 4.15.6 Version: 4.9.10 |
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"role": "CISA Coordinator",
"timestamp": "2026-09-11T13:32:52.855324Z",
"version": "2.0.3"
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"version": "4.3(1.230097)"
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{\"status\": \"affected\", \"version\": \"4.0(2m)\"}, {\"status\": \"affected\", \"version\": \"4.0(2k)\"}, {\"status\": \"affected\", \"version\": \"4.0(1c)\"}, {\"status\": \"affected\", \"version\": \"4.0(4f)\"}, {\"status\": \"affected\", \"version\": \"4.0(4c)\"}, {\"status\": \"affected\", \"version\": \"3.1(3d)\"}, {\"status\": \"affected\", \"version\": \"3.1(2g)\"}, {\"status\": \"affected\", \"version\": \"3.1(2c)\"}, {\"status\": \"affected\", \"version\": \"4.0(1d)\"}, {\"status\": \"affected\", \"version\": \"3.1(2e)\"}, {\"status\": \"affected\", \"version\": \"4.0(1a)\"}, {\"status\": \"affected\", \"version\": \"4.0(1b)\"}, {\"status\": \"affected\", \"version\": \"3.1(3b)\"}, {\"status\": \"affected\", \"version\": \"4.0(4b)\"}, {\"status\": \"affected\", \"version\": \"3.1(2b)\"}, {\"status\": \"affected\", \"version\": \"4.0(4e)\"}, {\"status\": \"affected\", \"version\": \"3.1(3h)\"}, {\"status\": \"affected\", \"version\": \"4.0(4l)\"}, {\"status\": \"affected\", \"version\": \"4.1(1g)\"}, {\"status\": \"affected\", \"version\": \"4.1(2a)\"}, {\"status\": \"affected\", \"version\": \"4.0(2n)\"}, {\"status\": \"affected\", \"version\": \"4.1(1h)\"}, {\"status\": \"affected\", \"version\": \"3.1(3k)\"}, {\"status\": \"affected\", \"version\": \"4.1(2b)\"}, {\"status\": \"affected\", \"version\": \"4.0(2o)\"}, {\"status\": \"affected\", \"version\": \"4.0(4m)\"}, {\"status\": \"affected\", \"version\": \"4.1(2d)\"}, {\"status\": \"affected\", \"version\": \"4.1(3b)\"}, {\"status\": \"affected\", \"version\": \"4.0(2p)\"}, {\"status\": \"affected\", \"version\": \"4.1(2e)\"}, {\"status\": \"affected\", \"version\": \"4.1(2f)\"}, {\"status\": \"affected\", \"version\": \"4.0(4n)\"}, {\"status\": \"affected\", \"version\": \"4.0(2q)\"}, {\"status\": \"affected\", \"version\": \"4.1(3c)\"}, {\"status\": \"affected\", \"version\": \"4.0(2r)\"}, {\"status\": \"affected\", \"version\": \"4.1(3d)\"}, {\"status\": \"affected\", \"version\": \"4.1(2g)\"}, {\"status\": \"affected\", \"version\": \"4.1(2h)\"}, {\"status\": \"affected\", \"version\": \"4.1(3g)\"}, {\"status\": \"affected\", \"version\": \"4.1(3f)\"}, {\"status\": \"affected\", \"version\": \"4.1(2j)\"}, {\"status\": \"affected\", \"version\": \"4.1(2k)\"}, {\"status\": \"affected\", \"version\": \"4.1(3h)\"}, {\"status\": \"affected\", \"version\": \"4.2(2a)\"}, {\"status\": \"affected\", \"version\": \"4.1(3i)\"}, {\"status\": \"affected\", \"version\": \"4.2(2f)\"}, {\"status\": \"affected\", \"version\": \"4.2(2g)\"}, {\"status\": \"affected\", \"version\": \"4.2(3b)\"}, {\"status\": \"affected\", \"version\": \"4.1(3l)\"}, {\"status\": \"affected\", \"version\": \"4.2(3d)\"}, {\"status\": \"affected\", \"version\": \"4.3(1.230097)\"}, {\"status\": \"affected\", \"version\": \"4.2(1e)\"}, {\"status\": \"affected\", \"version\": \"4.2(1b)\"}, {\"status\": \"affected\", \"version\": \"4.2(1j)\"}, {\"status\": \"affected\", \"version\": \"4.2(1i)\"}, {\"status\": \"affected\", \"version\": \"4.2(1f)\"}, {\"status\": \"affected\", \"version\": \"4.2(1a)\"}, {\"status\": \"affected\", \"version\": \"4.2(1c)\"}, {\"status\": \"affected\", \"version\": \"4.2(1g)\"}, {\"status\": \"affected\", \"version\": \"4.3(1.230124)\"}, {\"status\": \"affected\", \"version\": \"4.1(2l)\"}, {\"status\": \"affected\", \"version\": \"4.2(3e)\"}, {\"status\": \"affected\", \"version\": \"4.3(1.230138)\"}, {\"status\": \"affected\", \"version\": \"4.2(3g)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.230207)\"}, {\"status\": \"affected\", \"version\": \"4.2(3h)\"}, {\"status\": \"affected\", \"version\": \"4.2(3i)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.230270)\"}, {\"status\": \"affected\", \"version\": \"4.1(3m)\"}, {\"status\": \"affected\", \"version\": \"4.1(2m)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.240002)\"}, {\"status\": \"affected\", \"version\": \"4.3(3.240022)\"}, {\"status\": \"affected\", \"version\": \"4.2(3j)\"}, {\"status\": \"affected\", \"version\": \"4.1(3n)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.240009)\"}, {\"status\": \"affected\", \"version\": \"4.3(3.240041)\"}, {\"status\": \"affected\", \"version\": \"4.2(3k)\"}, {\"status\": \"affected\", \"version\": \"4.3(3.240043)\"}, {\"status\": \"affected\", \"version\": \"4.3(4.240142)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.240037)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.240053)\"}, {\"status\": \"affected\", \"version\": \"4.3(4.240152)\"}, {\"status\": \"affected\", \"version\": \"4.2(3l)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.240077)\"}, {\"status\": \"affected\", \"version\": \"4.3(4.242028)\"}, {\"status\": \"affected\", \"version\": \"4.3(4.241063)\"}, {\"status\": \"affected\", \"version\": \"4.3(4.242038)\"}, {\"status\": \"affected\", \"version\": \"4.2(3m)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.240090)\"}, {\"status\": \"affected\", \"version\": \"4.3(5.240021)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.240107)\"}, {\"status\": \"affected\", \"version\": \"4.3(4.242066)\"}, {\"status\": \"affected\", \"version\": \"4.2(3n)\"}, {\"status\": \"affected\", \"version\": \"4.3(5.250001)\"}, {\"status\": \"affected\", \"version\": \"4.2(3o)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.250016)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.250021)\"}, {\"status\": \"affected\", \"version\": \"4.3(5.250030)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.250022)\"}, {\"status\": \"affected\", \"version\": \"4.3(6.250039)\"}, {\"status\": \"affected\", \"version\": \"4.3(6.250040)\"}, {\"status\": \"affected\", \"version\": \"4.3(5.250033)\"}, {\"status\": \"affected\", \"version\": \"4.3(6.250044)\"}, {\"status\": \"affected\", \"version\": \"4.3(6.250053)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.250037)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.250045)\"}, {\"status\": \"affected\", \"version\": \"4.3(4.252001)\"}, {\"status\": \"affected\", \"version\": \"4.3(4.252002)\"}, {\"status\": \"affected\", \"version\": \"6.0(1.250127)\"}, {\"status\": \"affected\", \"version\": \"4.2(3p)\"}, {\"status\": \"affected\", \"version\": \"6.0(1.250131)\"}, {\"status\": \"affected\", \"version\": \"4.3(6.250101)\"}, {\"status\": \"affected\", \"version\": \"6.0(1.250174)\"}, {\"status\": \"affected\", \"version\": \"4.3(6.250117)\"}, {\"status\": \"affected\", \"version\": \"4.3(5.250043)\"}, {\"status\": \"affected\", \"version\": \"4.3(5.250045)\"}, {\"status\": \"affected\", \"version\": \"4.3(6.250060)\"}, {\"status\": \"affected\", \"version\": \"6.0(1.250130)\"}, {\"status\": \"affected\", \"version\": \"4.3(4.241014)\"}, {\"status\": \"affected\", \"version\": \"6.0(1.251030)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.250063)\"}, {\"status\": \"affected\", \"version\": \"6.0(1.250192)\"}, {\"status\": \"affected\", \"version\": \"4.3(6.260003)\"}, {\"status\": \"affected\", \"version\": \"6.0(1.250194)\"}, {\"status\": \"affected\", \"version\": \"6.0(1.260001)\"}, {\"status\": \"affected\", \"version\": \"4.3(6.260017)\"}, {\"status\": \"affected\", \"version\": \"4.3(2.260007)\"}, {\"status\": \"affected\", \"version\": \"6.0(2.260044)\"}, {\"status\": \"affected\", \"version\": \"6.0(2.260042)\"}, {\"status\": \"affected\", \"version\": \"4.0(1.260003)\"}, {\"status\": \"affected\", \"version\": \"2.0(2.260062)\"}, {\"status\": \"affected\", \"version\": \"2.0(1.250127)\"}, {\"status\": \"affected\", \"version\": \"2.0(1.250096)\"}, {\"status\": \"affected\", \"version\": \"4.0(1.260004)\"}, {\"status\": \"affected\", \"version\": \"6.0(2.260026)\"}, {\"status\": \"affected\", \"version\": \"6.0(1.251006)\"}, {\"status\": \"affected\", \"version\": \"1.2(0.250011)\"}, {\"status\": \"affected\", \"version\": \"1.1(0.250016)\"}, {\"status\": \"affected\", \"version\": \"1.0(0.240001)\"}, {\"status\": \"affected\", \"version\": \"1.0(0.250003)\"}, {\"status\": \"affected\", \"version\": \"1.2(0.250013)\"}, {\"status\": \"affected\", \"version\": \"1.1(0.250026)\"}, {\"status\": \"affected\", \"version\": \"1.0(1.250002)\"}, {\"status\": \"affected\", \"version\": \"1.1(0.250022)\"}, {\"status\": \"affected\", \"version\": \"1.1(0.250025)\"}, {\"status\": \"affected\", \"version\": \"1.0(1.250032)\"}, {\"status\": \"affected\", \"version\": \"6.0(2.260034)\"}, {\"status\": \"affected\", \"version\": \"6.0(2.260069)\"}, {\"status\": \"affected\", \"version\": \"4.3(6.260033)\"}, {\"status\": \"affected\", \"version\": \"2.0(2.260101)\"}, {\"status\": \"affected\", \"version\": \"4.2(3q)\"}, {\"status\": \"affected\", \"version\": \"4.2(3r)\"}, {\"status\": \"affected\", \"version\": \"1.2(0.260005)\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Cisco\", \"product\": \"Cisco Unified Computing System E-Series Software (UCSE)\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.11.1\"}, {\"status\": \"affected\", \"version\": \"4.12.1\"}, {\"status\": \"affected\", \"version\": \"4.12.2\"}, {\"status\": \"affected\", \"version\": \"4.15.2\"}, {\"status\": \"affected\", \"version\": \"4.15.3\"}, {\"status\": \"affected\", \"version\": \"4.15.4\"}], \"defaultStatus\": \"unknown\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco PSIRT is aware that proof-of-concept exploit code is available for the vulnerability described in this advisory.\\r\\n\\r\\nThe Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-uefi-sb-bypass-eb6xC5GW\", \"name\": \"cisco-sa-ucs-uefi-sb-bypass-eb6xC5GW\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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\u0026nbsp;or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software.\\r\\n\\r\\nThis 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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-749\", \"description\": \"Exposed Dangerous Method or Function\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-09-16T03:57:05.926Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20293\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-16T03:57:05.926Z\", \"dateReserved\": \"2025-10-08T11:59:15.405Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-09-08T16:04:40.874Z\", \"assignerShortName\": \"cisco\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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