Cyber Resilience

CVE-2023-21671

Critical

Published: 07 November 2023

Published
07 November 2023
Modified
11 August 2025
KEV Added
Patch
CVSS Score v3.1 9.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.0006 19.5th percentile
Risk Priority 19 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2023-21671 is a critical-severity Improper Input Validation (CWE-20) vulnerability in Qualcomm Fastconnect 6700 Firmware. Its CVSS base score is 9.3 (Critical).

Operationally, ranked at the 19.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Memory Corruption in Core during syscall for Sectools Fuse comparison feature.

CWE(s)

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

qualcomm
fastconnect 6700 firmware
all versions
qualcomm
fastconnect 6900 firmware
all versions
qualcomm
qca6391 firmware
all versions
qualcomm
qcm6490 firmware
all versions
qualcomm
qcs6490 firmware
all versions
qualcomm
qsm8350 firmware
all versions
qualcomm
video collaboration vc3 platform firmware
all versions
qualcomm
sd888 firmware
all versions
qualcomm
sm7315 firmware
all versions
qualcomm
sm7325p firmware
all versions
+14 more product configuration(s) — see NVD for full list

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-20

Security testing and developer training directly verify and enforce proper input validation, reducing exploitability of injection and malformed-data weaknesses.

addresses: CWE-20

Security testing and evaluation at multiple SDLC stages directly detects missing or flawed input validation, with the required remediation process ensuring fixes are applied.

addresses: CWE-20

Directly implements checks on information inputs to reject invalid data before processing.

addresses: CWE-20

Spam protection mechanisms perform filtering and detection on inbound/outbound messages, directly compensating for missing or weak input validation of unsolicited content.

References