CVE-2026-20293

HIGHPre-NVD 7.17.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. A secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-72936 (ENISA EUVD) · GHSA-xv95-6ccg-fmwj (GitHub Security Advisories)Source: ENISA EUVD

7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity71% × 45%
Impact severity (EG Severity): CVSS 7.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.1): severity, escalated by confirmed exploitation. This CVE's 7.1 is its impact severity (EG Severity), not escalated.

EG Severity
7.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-09). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 8, 2026

Last Modified

October 26, 2026

Advisory Details (1)

Auto-updated Sep 8, 2026
Patch available.
Web page

Cisco UCS and UCS-Based Appliances UEFI Shell Secure Boot Bypass Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-uefi-sb-bypass-eb6xC5GW

Vendor Advisories for CVE-2026-20293(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 35× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 170 rows on record for this CVE, as 99 entries (1 repeat merged).

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 70 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  2. 2026-11-11 16:39 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  3. 2026-11-10 16:42 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  4. 2026-11-09 17:21 UTCEchelonGraph re-scored
  5. 2026-11-09 17:21 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  6. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  7. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  8. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  9. 2026-11-06 16:37 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  10. 2026-11-05 16:37 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  11. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  12. 2026-11-03 16:47 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  13. 2026-11-02 18:55 UTCEchelonGraph re-scored
  14. 2026-11-02 18:55 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  15. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  16. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  17. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  18. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  19. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  20. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  21. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  22. 2026-10-26 20:28 UTCEchelonGraph re-scored
  23. 2026-10-26 20:28 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  24. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  25. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
Show 74 more
  1. 2026-10-25 14:44 UTCEchelonGraph re-scored
  2. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  3. 2026-10-24 16:23 UTCEchelonGraph re-scored
  4. 2026-10-24 16:23 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  5. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  6. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  7. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  8. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  9. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  10. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  11. 2026-10-18 03:57 UTCEchelonGraph re-scored
  12. 2026-10-17 17:36 UTCEchelonGraph re-scored
  13. 2026-10-17 17:36 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  14. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  15. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  16. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  17. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  18. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  19. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  20. 2026-10-12 16:24 UTCEchelonGraph re-scored
  21. 2026-10-11 20:05 UTCEchelonGraph re-scored
  22. 2026-10-11 16:44 UTCEchelonGraph re-scored
  23. 2026-10-11 16:43 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  24. 2026-10-11 14:51 UTCEchelonGraph re-scored
  25. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  26. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  27. 2026-10-10 10:47 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  28. 2026-10-09 22:30 UTCEchelonGraph re-scored
  29. 2026-10-09 22:30 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  30. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  31. 2026-10-09 00:39 UTCEchelonGraph re-scored
  32. 2026-10-09 00:39 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  33. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  34. 2026-10-07 22:32 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  35. 2026-10-07 09:25 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  36. 2026-10-06 21:09 UTCEchelonGraph re-scored
  37. 2026-10-06 21:09 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  38. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  39. 2026-10-06 08:45 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  40. 2026-10-05 20:27 UTCEchelonGraph re-scored
  41. 2026-10-05 20:27 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  42. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  43. 2026-10-05 08:00 UTCEchelonGraph re-scored
  44. 2026-10-05 08:00 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  45. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  46. 2026-10-04 19:44 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  47. 2026-10-04 07:28 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  48. 2026-10-03 19:13 UTCEchelonGraph re-scored
  49. 2026-10-03 19:13 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  50. 2026-10-03 06:35 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  51. 2026-10-02 18:19 UTCEchelonGraph re-scored
  52. 2026-10-02 18:19 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  53. 2026-10-02 05:54 UTCEchelonGraph re-scored
  54. 2026-10-02 05:54 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  55. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  56. 2026-10-01 15:42 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  57. 2026-10-01 03:26 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  58. 2026-09-30 15:11 UTCEchelonGraph re-scored
  59. 2026-09-30 15:11 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  60. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  61. 2026-09-30 02:20 UTCEchelonGraph re-scored
  62. 2026-09-30 02:20 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  63. 2026-09-29 15:21 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  64. 2026-09-29 05:06 UTCEchelonGraph re-scored
  65. 2026-09-29 05:06 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  66. 2026-09-28 16:49 UTCEchelonGraph re-scored
  67. 2026-09-28 16:49 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  68. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  69. 2026-09-28 04:30 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  70. 2026-09-27 16:14 UTCEchelonGraph re-scored
  71. 2026-09-27 16:14 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1
  72. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  73. 2026-09-27 03:59 UTCEchelonGraph re-scored
  74. 2026-09-27 03:59 UTCGHSA enrichmentGHSA-xv95-6ccg-fmwj · GitHub severity HIGH · GitHub CVSS 7.1

Frequently asked(5)

What is CVE-2026-20293?
CVE-2026-20293 is a high-severity vulnerability; its CVE record was published on September 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…
When was the CVE record for CVE-2026-20293 published?
The CVE record for CVE-2026-20293 was published on September 8, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-20293 actively exploited?
CVE-2026-20293 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-20293?
CVE-2026-20293 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-20293?
A fix for CVE-2026-20293 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-20293 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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