CVE-2022-40799
CVE-2022-40799 is a security flaw in D-Link DNR-322L, routers for homes and small offices. Attackers are using a flaw in D-Link DNR-322L. 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 DNR-322L 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 download of code without integrity check in D-Link DNR-322L. In its words: “D-Link DNR-322L contains a download of code without integrity check vulnerability that could allow an authenticated attacker to execute OS level commands on the device. 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 CWE-494, 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 DNR-322L.
Every device with D-Link DNR-322L needs the update.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 5 Aug 2025, 980 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 34%. That’s in the top 2% 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 DNR-322L 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 34%.[4] |
See also
Other D-Link flaws
- CVE-2025-29635, D-Link DIR-823X: command injection ·
- CVE-2022-37055, D-Link Routers: buffer overflow ·
- CVE-2020-25079, D-Link DCS-2530L and DCS-2670L Devices: DCS-2530L and DCS-2670L command injection ·
- CVE-2020-25078, D-Link DCS-2530L and DCS-2670L Devices: unspecified ·
- CVE-2024-0769, D-Link DIR-859 Router: path traversal ·
Similar flaws
- CVE-2026-3502, TrueConf Client: download of code without integrity check ·
- CVE-2025-15556, Notepad++: download of code without integrity check ·
- CVE-2021-44168, Fortinet FortiOS: arbitrary file download ·
Added the same day
- CVE-2020-25079, D-Link DCS-2530L and DCS-2670L Devices: DCS-2530L and DCS-2670L command injection ·
- 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 DNR-322L Download of Code Without Integrity Check Vulnerability”. Known Exploited Vulnerabilities Catalog, added 5 Aug 2025.
- ^ National Institute of Standards and Technology. “CVE-2022-40799 Detail”. National Vulnerability Database, published 29 Nov 2022.
- ^ D-Link. Advisories and fixes: dlink.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.337, percentile 98.4, 31 Oct 2026.
- CVE Program. “CVE-2022-40799”. 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.