Improper buffer restrictions in BIOS firmware for some Intel(R) Processors may allow a privileged user to potentially enable escalation of…

published 2020-11-12 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-2089

cvss: 6.7; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits: 0; none known

Improper buffer restrictions in BIOS firmware for some Intel(R) Processors may allow a privileged user to potentially enable escalation of privilege via local access.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-131-15 updated 2025-05-06 cvss 6.7

Siemens SIMATIC S7-1500

Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (MLFB: 6ES7518-4AX00-1AC0, 6AG1518-4AX00-4AC0, incl. SIPLUS variant) Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
affected: mitigation, no fix planned

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.7	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	4.6	AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

n/a Intel(R) Processors

References

intel.com /content/www/us/en/security-center/advisory/intel-sa-00358
vendor-advisory
security.netapp.com /advisory/ntap-20201113-0001/
third-party-advisory
cert-portal.siemens.com /productcert/pdf/ssa-501073.pdf
third-party-advisory

Sources

CVE List CVE-2020-0591
NVD CVE-2020-0591

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary