What is CVE-2021-33259?

CVE-2021-33259 is a medium-severity vulnerability in D-Link Dir-868lw Firmware, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2021-10-31.

How severe is CVE-2021-33259?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in D-Link Dir-868lw Firmware

CVE-2021-33259

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.

Vulnerability class: Broken Authentication

Published 2021-10-31 · last modified 2026-07-09.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.018 (77.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

D-Link Dir-868lw Firmware — versions 1.12b
Dlink Dir-868lw

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

af854a3a-2127-422b-91ae-364da2661108 (Broken Link)
www.dlink.com/en/security-bulletin/ (Not Applicable)
af854a3a-2127-422b-91ae-364da2661108 (URL Repurposed, Broken Link)
github.com/jayus0821/uai-poc/blob/main/D-Link/DIR-868L/webaccess_UAI.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-33259?: CVE-2021-33259 is a medium-severity vulnerability in D-Link Dir-868lw Firmware, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2021-10-31.
How severe is CVE-2021-33259?: Medium severity. CVSS v3 base score is 5.3 out of 10.