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Fencer Intel
high 7.9

CVE-2022-21198 json

Time-of-check time-of-use race condition in the BIOS firmware for some Intel(R) Processors may allow a privileged user to potentially enabl…

published 3y ago modified 2mo ago also EUVD-2022-26432

cvss
7.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

Time-of-check time-of-use race condition in the BIOS firmware for some Intel(R) Processors may allow a privileged user to potentially enable escalation of privilege via local access.

Patch / fix

  • Siemens SIMATIC Field PG M5 V22.01.11
  • Siemens SIMATIC Field PG M6 V26.01.11
  • Siemens SIMATIC IPC BX-39A V29.01.03
  • Siemens SIMATIC IPC PX-39A V29.01.03
  • Siemens SIMATIC IPC PX-39A PRO V29.01.03
  • Siemens SIMATIC IPC427E V21.01.19
  • Siemens SIMATIC IPC477E V21.01.19
  • Siemens SIMATIC IPC477E PRO V21.01.19
  • Siemens SIMATIC IPC627E V25.02.14
  • Siemens SIMATIC IPC647E V25.02.14
  • Siemens SIMATIC IPC677E V25.02.14
  • Siemens SIMATIC IPC847E V25.02.14
  • Siemens SIPLUS IPC427E V21.01.19

Is CVE-2022-21198 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

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

cisa ICSA-23-047-09 updated cvss 7.9

Siemens SIMATIC Industrial Products

  • Siemens SIMATIC Field PG M5 <V22.01.11
    affected: fixed in V22.01.11, workaround
  • Siemens SIMATIC Field PG M6 <V26.01.11
    affected: fixed in V26.01.11, workaround
  • Siemens SIMATIC IPC BX-39A <V29.01.03 Siemens SIMATIC IPC PX-39A <V29.01.03 Siemens SIMATIC IPC PX-39A PRO <V29.01.03
    affected: fixed in V29.01.03, workaround
  • Siemens SIMATIC IPC427E <V21.01.19 Siemens SIMATIC IPC477E <V21.01.19 Siemens SIMATIC IPC477E PRO <V21.01.19
    affected: fixed in V21.01.19, workaround
  • Siemens SIMATIC IPC627E <V25.02.14 Siemens SIMATIC IPC647E <V25.02.14 Siemens SIMATIC IPC677E <V25.02.14 Siemens SIMATIC IPC847E <V25.02.14
    affected: fixed in V25.02.14, workaround
  • Siemens SIMATIC ITP1000
    affected: workaround, no fix available
  • Siemens SIPLUS IPC427E <V21.01.19
    affected: fixed in V21.01.19, workaround

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.9 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H
NVD 3.1 6.4 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

  • n/a Intel(R) Processors
  • Siemens SIMATIC Field PG M5
  • Siemens SIMATIC Field PG M6
  • Siemens SIMATIC IPC BX-39A
  • Siemens SIMATIC IPC PX-39A
  • Siemens SIMATIC IPC PX-39A PRO
  • Siemens SIMATIC IPC427E
  • Siemens SIMATIC IPC477E
  • Siemens SIMATIC IPC477E PRO
  • Siemens SIMATIC IPC627E
  • Siemens SIMATIC IPC647E
  • Siemens SIMATIC IPC677E
  • Siemens SIMATIC IPC847E
  • Siemens SIMATIC ITP1000
  • Siemens SIPLUS IPC427E

Classification

Weakness
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

References

Sources

Fencer Intel 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.