What is CVE-2011-4723?

CVE-2011-4723 is D-Link DIR-300 Router Cleartext Storage of a Password Vulnerability. The supplied enrichment data classifies it as Unclassified mapped to CWE-312 CWE-312.

Which versions are affected?

Affected product and version evidence is listed in the product table above. Current public advisories should be checked for exact version scope before patch targeting is finalized.

Is there active exploitation?

Yes: CISA KEV signal present. If exploitation is not confirmed from current sources, teams should document that status and continue monitoring KEV, vendor, and telemetry updates.

Yes. The supplied enrichment data lists CVE-2011-4723 in CISA KEV with required action: The impacted product is end-of-life and should be disconnected if still in use.. KEV status should be monitored because it can change after initial disclosure or after exploitation becomes publicly confirmed.

Is there a public exploit?

A public PoC is not confirmed from current sources for CVE-2011-4723. Public exploit or PoC availability should raise triage priority, especially for exposed or business-critical systems.

How can defenders detect it?

Start with web/proxy/WAF logs, application logs, network IDS/IPS where available. Look for vulnerability-class behavior, product errors, suspicious authentication events, exploit probes, and abnormal process activity based only on evidence that applies to the affected product.

How should teams prioritize it?

Prioritize CVE-2011-4723 using CVSS 6.8, EPSS 3%, KEV status, public PoC status, and asset exposure. Internet-facing, privileged, or business-critical deployments should be handled first.

Are workarounds available?

The supplied mitigation guidance says to apply vendor patches and restrict external exposure until fixed. Fixed-version evidence is listed in the mitigation section above.

Which threat actors are linked publicly?

No public threat actor linkage is confirmed from current sources. Do not attribute exploitation to a threat actor unless the source evidence explicitly supports that linkage.

What should be done in the next 24 hours?

Identify exposed assets running affected vendor/product/version combinations. Treat as emergency remediation because CISA KEV status is present. Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class. Open remediation tickets with affected assets, owners, evidence status, and detection coverage so decisions are traceable.

CISA KEVmedium

CVE-2011-4723

CVE-2011-4723 — D-Link DIR-300 Router Cleartext Storage of a Password Vulnerability

The D-Link DIR-300 router stores cleartext passwords, which allows context-dependent attackers to obtain sensitive information via unspecified vectors.

Published Dec 20, 2011Updated Jun 16, 2026Sources: NVD, CISA, FIRST EPSS

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Confirmed

CISA KEV, listed Sep 8, 2022

EPSS

ahead of 86% of scored CVEs

Affects

D-Link

DIR-300 Router

CVSS base

6.8

medium · 2 sources

CISA SSVC assessment

Three decision points CISA publishes for the CVEs it assesses · SSVC 2.0.3. A stakeholder decision, not a severity score.

CISA

Exploitation

Active

none · proof-of-concept · active

Automatable

can an attacker script all four kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

The vendor's own words where we have them.

Upgrade DIR-300 Router to a fixed release. Apply vendor patches per advisory and restrict external exposure of the affected component until patched.

CISA required action

The impacted product is end-of-life and should be disconnected if still in use.

Federal deadline Sep 29, 2022 — passed 1,450 days ago

First 24 hours

Ordered from the record's own fields — exposure first, because you cannot patch what you have not found.

Identify exposed assets running affected vendor/product/version combinations.
Treat as emergency remediation because CISA KEV status is present.
Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class.

Affected scope

Vendor, product and version as the advisories word them.

Vendor	Product	Versions	Status
D-Link	DIR-300 Router	—	Vulnerable

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Availability

None

Confidentiality

Changed

Integrity

None

Attack Complexity

Low

Attack Vector

Network

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
5.7	CVSS 3.1	medium	2.1	3.6	CNA
6.8	CVSS 2.0	medium	8	6.9	NVD

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weakness & attack patterns

CWE-312

Inferred from the weakness class — not observed against this CVE.

T1005Data from Local System
T1552.004Unsecured Credentials: Private Keys

CISA KEV details

CISA lists a CVE here once it has evidence of exploitation against real targets.

CISAThat month →

Listed

Sep 8, 2022

Federal deadline

Sep 29, 2022

passed 1,450 days ago

Ransomware use

Unknown

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a date to argue against.

Detection

Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.

Prioritize edge telemetry for network-reachable DIR-300 Router.

web/proxy/WAF logsapplication logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first — with the readings a source repeats on a schedule counted underneath rather than listed.

2026
Added · CVSS 3.1 6.8 (AV:N)
Jun 16, 2026 · NVD
2022
Added to CISA KEV catalog
Sep 8, 2022 · CISA
2011
Initial · CVE published
Dec 20, 2011 · NVD

References

4 on the record

en.securitylab.ru/lab/PT-2011-30
Broken Link
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2011-4723
US Government Resource
www.dlink.com/uk/en/support/product/dir-300-wireless-g-router
Vendor Advisory
nvd.nist.gov/vuln/detail/CVE-2011-4723
Vendor Advisory

Elsewhere on this site

D-Linkevery CVE for this vendor
September 2022what else CISA listed
Unclassifiedsame class
CWE-312other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record1

What should defenders know first?

CVE-2011-4723 is D-Link DIR-300 Router Cleartext Storage of a Password Vulnerability, a medium vulnerability affecting DIR-300 Router from D-Link. The current evidence lists it in CISA KEV, and the exploit status is: Yes: CISA KEV signal present. Public exploit evidence is: A public PoC is not confirmed from current sources for CVE-2011-4723. The affected-version evidence is listed in the key facts and affected products tables. Defenders should first verify whether exposed or business-critical assets run those versions, then apply vendor patches or mitigations, restrict reachable attack surface, and preserve logs for detection review. CVSS 6.8 describes technical severity, while EPSS 3% helps estimate near-term exploit likelihood; neither replaces asset context. Unknown fields should remain explicit in tickets, and threat actor, IOC, victimology, or payload claims should not be added unless a cited source supports them. Monitor CISA KEV, vendor advisories, NVD changes, public PoC repositories, and internal telemetry for update triggers.