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Fencer Vulns
high 8.8

CVE-2023-23912 json

A vulnerability, found in EdgeRouters Version 2.0.9-hotfix.5 and earlier and UniFi Security Gateways (USG) Version 4.4.56 and earlier with…

published 2023-02-09 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-27995

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

A vulnerability, found in EdgeRouters Version 2.0.9-hotfix.5 and earlier and UniFi Security Gateways (USG) Version 4.4.56 and earlier with their DHCPv6 prefix delegation set to dhcpv6-stateless or dhcpv6-stateful, allows a malicious actor directly connected to the WAN interface of an affected device to create a remote code execution vulnerability.

Patch / fix

  • ui usg_firmware 4.4.57
  • ui usg-pro-4_firmware 4.4.57
  • ui er-10x_firmware 2.0.9
  • ui er-12_firmware 2.0.9
  • ui er-12p_firmware 2.0.9
  • ui er-4_firmware 2.0.9
  • ui er-6p_firmware 2.0.9
  • ui er-8-xg_firmware 2.0.9
  • ui er-x_firmware 2.0.9
  • ui er-x-sfp_firmware 2.0.9

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
19 mo ago

Exploit prediction

0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • community.ui.com https://community.ui.com/releases/Security-Advisory-Bulletin-028-028/696e4e3b-718c-4da4-9a21-965a85633b5f referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • n/a Ubiquiti EdgeRouter(s) and USG(s)

Classification

Weakness
  • CWE-75 Failure to Sanitize Special Elements into a Different Plane
  • CWE-94 Improper Control of Generation of Code

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.