Multiple D-Link DSL gateway devices contain a command injection vulnerability in the dnscfg.cgi endpoint due to improper sanitization of user-supplied DNS configuration parameters. An unauthenticated remote attacker can inject and execute arbitrary shell commands, resulting in remote code execution. The affected endpoint is also associated with unauthenticated DNS modification (“DNSChanger”) behavior documented by D-Link, which reported active exploitation campaigns targeting firmware variants of the DSL-2740R, DSL-2640B, DSL-2780B, and DSL-526B models from 2016 through 2019. Exploitation evidence was observed by the Shadowserver Foundation on 2025-11-27 (UTC). Affected devices were declared end-of-life/end-of-service in early 2020.
Metrics
Affected Vendors & Products
References
History
Wed, 07 Jan 2026 16:30:00 +0000
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Tue, 06 Jan 2026 14:30:00 +0000
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D-link
D-link dsl-2640b D-link dsl-2740r D-link dsl-2780b D-link dsl-526b |
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D-link
D-link dsl-2640b D-link dsl-2740r D-link dsl-2780b D-link dsl-526b |
Mon, 05 Jan 2026 21:30:00 +0000
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| Description | Multiple D-Link DSL gateway devices contain a command injection vulnerability in the dnscfg.cgi endpoint due to improper sanitization of user-supplied DNS configuration parameters. An unauthenticated remote attacker can inject and execute arbitrary shell commands, resulting in remote code execution. The affected endpoint is also associated with unauthenticated DNS modification (“DNSChanger”) behavior documented by D-Link, which reported active exploitation campaigns targeting firmware variants of the DSL-2740R, DSL-2640B, DSL-2780B, and DSL-526B models from 2016 through 2019. Exploitation evidence was observed by the Shadowserver Foundation on 2025-11-27 (UTC). Affected devices were declared end-of-life/end-of-service in early 2020. | |
| Title | D-Link DSL Command Injection via DNS Configuration Endpoint | |
| Weaknesses | CWE-78 | |
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cvssV4_0
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-01-05T21:14:48.992Z
Updated: 2026-01-07T16:14:46.842Z
Reserved: 2026-01-05T20:59:29.705Z
Link: CVE-2026-0625
No data.
Status : Received
Published: 2026-01-05T22:15:54.483
Modified: 2026-01-07T17:16:02.250
Link: CVE-2026-0625
No data.