The Microchip RN4870 module firmware 1.43 (and the Microchip PIC LightBlue Explorer Demo 4.2 DT100112) mishandles reject messages.

published 2022-12-19 3y ago modified 2026-06-17 4mo ago also EUVD-2022-49212

cvss: 8.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits: 0; none known

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CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: last yr. (2025-04-17)

Exploit prediction

0.89% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

computer.org https://www.computer.org/csdl/proceedings-article/sp/2023/933600a521/1He7Yja1AYM referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
NVD	3.1	8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
CNA	3.1	8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Classification

Weakness

CWE-755 Improper Handling of Exceptional Conditions

References

computer.org /csdl/proceedings-article/sp/2023/933600a521/1He7Yja1AYM
exploit, technical-description, third-party-advisory
microchip.com /en-us/products/wireless-connectivity/software-vulnerability-response/deviating-behaviors-in-bluetooth-le
vendor-advisory
computer.org /csdl/proceedings/sp/2023/1He7WWuJExG
third-party-advisory
microchip.com
product

Sources

CVE List CVE-2022-46403
NVD CVE-2022-46403

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.