CVE-2011-4723
CVE-2011-4723 is a security flaw in D-Link DIR-300 Router, routers for homes and small offices. Attackers can read information from D-Link DIR-300 Router that should be private. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 8 Sep 2022.[1]
D-Link DIR-300 Router 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 cleartext storage of a password in D-Link DIR-300 Router. In its words: “The D-Link DIR-300 router stores cleartext passwords, which allows context-dependent attackers to obtain sensitive information.”[1]
The underlying weakness is CWE-310, in MITRE’s list of common software weaknesses.[2]
It scores 5.7 out of 10 on the Common Vulnerability Scoring System, which rates it medium, scored by the organisation that published the CVE 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 DIR-300 Router.
Every device with D-Link DIR-300 Router needs the update.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 8 Sep 2022, 3,915 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 29 Sep 2022 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 3%. That’s in the top 13% 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: “The impacted product is end-of-life and should be disconnected if still in use.”[1]
- Update D-Link DIR-300 Router 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 5.7.[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 3%.[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-2022-40799, D-Link DNR-322L: download of code without integrity check ·
- 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 ·
Added the same day
- CVE-2022-3075, Chrome and other Chromium browsers: insufficient data validation ·
- CVE-2022-27593, QNAP Photo Station: externally controlled reference ·
- CVE-2022-26258, D-Link DIR-820L: remote code execution ·
- CVE-2020-9934, Apple iOS, iPadOS, and macOS: input validation ·
- CVE-2018-7445, MikroTik RouterOS: stack-based buffer overflow ·
Every D-Link flaw on CISA’s list · Everything added in September 2022
References
- ^ Cybersecurity and Infrastructure Security Agency. “D-Link DIR-300 Router Cleartext Storage of a Password Vulnerability”. Known Exploited Vulnerabilities Catalog, added 8 Sep 2022.
- ^ National Institute of Standards and Technology. “CVE-2011-4723 Detail”. National Vulnerability Database, published 20 Dec 2011.
- ^ D-Link. Advisories and fixes: dlink.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.031, percentile 87.6, 31 Oct 2026.
- CVE Program. “CVE-2011-4723”. 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.