Integer overflow in Silicon Labs Gecko Bootloader leads to unbounded memory access

published 2023-10-20 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-44146

cvss: 7.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 16%
public exploits: 0; none known

An integer overflow in Silicon Labs Gecko Bootloader version 4.3.1 and earlier allows unbounded memory access when reading from or writing to storage slots.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-09-12)

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.7	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

silabs.com GSDK
silabs gecko_bootloader

Classification

Weakness

CWE-125 Out-of-bounds Read
CWE-787 Out-of-bounds Write
CWE-190 Integer Overflow or Wraparound

References

github.com /SiliconLabs/gecko_sdk/releases
release-notes
community.silabs.com /s/contentdocument/0698Y00000ZmXqLQAV
permissions-required

Sources

CVE List CVE-2023-3487
NVD CVE-2023-3487

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