MEDIUM
CVE-2021-33259
CWE-306Published: October 31, 2021· Updated: Jul 9, 2026
5.3
CVSS v3.1
Official Description
Several web interfaces in D-Link DIR-868LW 1.12b have no authentication requirements for access, allowing for attackers to obtain users' DNS query history.
Technical Analysis
CVE-2021-33259 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected Vendors & Products
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (4)
→
https://github.com/jayus0821/uai-poc/blob/main/D-Link/DIR-868L/webaccess_UAI.mdExploit · Third Party Advisory
→
https://www.dlink.com/en/security-bulletin/Not Applicable
→
https://github.com/jayus0821/uai-poc/blob/main/D-Link/DIR-868L/webaccess_UAI.mdExploit · Third Party Advisory
→
https://www.dlink.com/en/security-bulletin/Not Applicable
Quick Facts
CVE IDCVE-2021-33259
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-306
CISA KEVNo
Affected2 vendor(s)
PublishedOct 31, 2021
Related CVEs (CWE-306)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-33259 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.