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Fencer Vulns
critical 9.8

CVE-2023-4041 json

Second Stage Gecko Bootloader GBL Parser Buffer Overrun Vulnerability

published 2023-08-23 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-53933

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'), Out-of-bounds Write, Download of Code Without Integrity Check vulnerability in Silicon Labs Gecko Bootloader on ARM (Firmware Update File Parser modules) allows Code Injection, Authentication Bypass.This issue affects "Standalone" and "Application" versions of Gecko Bootloader.

Patch / fix

  • Silicon Labs Gecko Bootloader 4.2.4, 4.3.1, 4.3.2
  • silabs gecko_bootloader 4.2.4, 4.3.1, 4.3.2

Vendor advisories

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

cisa ICSA-25-153-01 updated cvss 9.8

Schneider Electric Wiser Home Automation

  • Schneider Electric Wiser AvatarOn 6K Freelocate Schneider Electric Wiser Cuadro H 5P Socket
    affected: vendor fix, mitigation se.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

cisa ICSA-25-140-06 updated cvss 9.8

Schneider Electric PrismaSeT Active - Wireless Panel Server

  • Schneider Electric PrismaSeT Active - Wireless Panel Server
    affected: mitigation

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
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Silicon Labs Gecko Bootloader
  • silabs gecko_bootloader

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input
  • CWE-787 Out-of-bounds Write
  • CWE-913 Improper Control of Dynamically-Managed Code Resources
  • CWE-494 Download of Code Without Integrity Check

References

Sources

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.