D-Link DIR-890L UART Port rgbin hard-coded credentials

published 2025-07-27 15 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-22822

cvss: 6.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits: 0; none known

A vulnerability, which was classified as critical, has been found in D-Link DIR-890L up to 111b04. This issue affects some unknown processing of the file rgbin of the component UART Port. The manipulation leads to hard-coded credentials. It is possible to launch the attack on the physical device. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 15 mo ago (2025-07-28)

Exploit prediction

0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/Nicholas-wei/bug-discovery/blob/main/dlink/dir890-hardcoded/dir890-hardcoded.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	7.0	CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
CNA	3.1	6.8	CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
CNA	3.0	6.8	CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
CNA	2.0	7.2	AV:L/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
CNA	4.0	5.2	CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA	3.1	6.8	CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	2.0	7.2	AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

D-Link DIR-890L

Classification

Weakness

CWE-798 Use of Hard-coded Credentials
CWE-259 Use of Hard-coded Password

References

github.com /Nicholas-wei/bug-discovery/blob/main/dlink/dir890-hardcoded/dir890-hardcoded.md
exploit
vuldb.com /?id.317819
vdb-entry, third-party-advisory
vuldb.com /?ctiid.317819
signature, permissions-required, vdb-entry
vuldb.com /?submit.622337
third-party-advisory, vdb-entry
dlink.com /
product

Sources

CVE List CVE-2025-8231
NVD CVE-2025-8231

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