CVE-2025-8231
Published: 27 July 2025
Summary
CVE-2025-8231 is a medium-severity Use of Hard-coded Password (CWE-259) vulnerability in Dlink Dir-890L Firmware. Its CVSS base score is 5.2 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Default Accounts (T1078.001); ranked in the top 35.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-22822
Vulnerability details
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…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Hard-coded credentials in rgbin binary for UART port enable use of default accounts (T1078.001) for physical access, discovery of credentials in files (T1552.001), and password guessing as noted in advisory (T1110.001).
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Changing default authenticators prior to first use directly prevents use of hard-coded passwords.
Intelligence programs surface reports of campaigns that abuse hard-coded credentials in products, prompting removal or replacement and thereby reducing successful exploitation.
Vetting reduces the chance a developer will deliberately insert hard-coded credentials as a backdoor or unauthorized access mechanism.
Supplier risk reviews identify and discourage hard-coded credentials in delivered products or services.
Enables users to notice when hard-coded credentials have been exploited for unauthorized access.
Security training explicitly warns against hard-coded credentials, lowering their use in systems.
Policy and procedures prohibit hard-coded credentials in favor of managed authentication.
External identity providers eliminate the need for hard-coded credentials in applications.