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Fencer Vulns
critical 9.0

CVE-2023-31475 in the critical feed json

An issue was discovered on GL.iNet devices before 3.216.

published 2023-05-11 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-35780

cvss
9.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
13.7%
EPSS 13.7% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

An issue was discovered on GL.iNet devices before 3.216. The function guci2_get() found in libglutil.so has a buffer overflow when an item is requested from a UCI context, and the value is pasted into a char pointer to a buffer without checking the size of the buffer.

Patch / fix

  • gl-inet gl-s20_firmware 3.216
  • gl-inet gl-x3000_firmware 3.216
  • gl-inet gl-mt3000_firmware 3.216
  • gl-inet gl-mt2500_firmware 3.216
  • gl-inet gl-mt2500a_firmware 3.216
  • gl-inet gl-axt1800_firmware 3.216
  • gl-inet gl-a1300_firmware 3.216
  • gl-inet gl-ax1800_firmware 3.216
  • gl-inet gl-sft1200_firmware 3.216
  • gl-inet gl-mt1300_firmware 3.216
  • gl-inet gl-e750_firmware 3.216
  • gl-inet gl-mv1000_firmware 3.216
  • gl-inet gl-mv1000w_firmware 3.216
  • gl-inet gl-s10_firmware 3.216
  • gl-inet gl-s200_firmware 3.216
  • gl-inet gl-s1300_firmware 3.216
  • gl-inet gl-sf1200_firmware 3.216
  • gl-inet gl-b1300_firmware 3.216
  • gl-inet gl-b2200_firmware 3.216
  • gl-inet gl-ap1300_firmware 3.216

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
21 mo ago

Exploit prediction

13.74% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/gl-inet/CVE-issues/blob/main/3.215/Buffer_Overflow.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/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
CNA 3.1 9.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

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.