CVE-2020-25079
CVE-2020-25079 is a security flaw in D-Link DCS-2530L and DCS-2670L Devices, routers for homes and small offices. Attackers can run commands on D-Link DCS-2530L and DCS-2670L Devices. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 5 Aug 2025.[1]
D-Link DCS-2530L and DCS-2670L Devices is in things households have: home and small-office routers, so the fix matters at home as much as at work. D-Link has published a fix or advice.
Description
CISA calls it a DCS-2530L and DCS-2670L command injection in D-Link DCS-2530L and DCS-2670L Devices. In its words: “D-Link DCS-2530L and DCS-2670L devices contains a command injection vulnerability in the cgi-bin/ddns_enc.cgi. The impacted products could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.”[1]
The underlying weakness is command injection (CWE-77), in MITRE’s list of common software weaknesses.[2]
It scores 8.8 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it; D-Link’s advisory has them[3]. CISA names the product as D-Link DCS-2530L and DCS-2670L Devices.
Every device with D-Link DCS-2530L and DCS-2670L Devices needs the update.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 5 Aug 2025, 1,798 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 26 Aug 2025 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 54%. That’s in the top 1% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
D-Link has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”[1]
- Update D-Link DCS-2530L and DCS-2670L Devices now.Open the router’s app, or its admin page in a browser, and look for a firmware update. Then turn on automatic updates, so the next fix arrives on its own.
- If the maker has stopped updating it, replace it.Routers stop getting fixes after a few years, and attackers keep a list of the ones that did. If there’s no newer firmware, it won’t be fixed.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 8.8.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 54%.[4] |
See also
Other D-Link DCS-2530L and DCS-2670L Devices flaws
- CVE-2020-25078: unspecified ·
Other D-Link flaws
- CVE-2025-29635, D-Link DIR-823X: command injection ·
- CVE-2022-37055, D-Link Routers: buffer overflow ·
- CVE-2022-40799, D-Link DNR-322L: download of code without integrity check ·
- CVE-2024-0769, D-Link DIR-859 Router: path traversal ·
- CVE-2023-25280, D-Link DIR-820 Router: OS command injection ·
Other command injection flaws
- CVE-2026-105134, AhsayCBS: command injection ·
- CVE-2026-96951, Microsoft Windows: command injection ·
- CVE-2016-3081, Apache Struts: command injection ·
- CVE-2026-8037, Progress LoadMaster: command injection ·
- CVE-2026-22719, Broadcom VMware Aria Operations: command injection ·
Added the same day
- CVE-2022-40799, D-Link DNR-322L: download of code without integrity check ·
- CVE-2020-25078, D-Link DCS-2530L and DCS-2670L Devices: unspecified ·
Every D-Link flaw on CISA’s list · Everything added in August 2025
References
- ^ Cybersecurity and Infrastructure Security Agency. “D-Link DCS-2530L and DCS-2670L Command Injection Vulnerability”. Known Exploited Vulnerabilities Catalog, added 5 Aug 2025.
- ^ National Institute of Standards and Technology. “CVE-2020-25079 Detail”. National Vulnerability Database, published 2 Sep 2020.
- ^ D-Link. Advisories and fixes: support.dlink.com, supportannouncement.us.dlink.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.540, percentile 99.0, 31 Oct 2026.
- CVE Program. “CVE-2020-25079”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.