CVE-2021-27342

5.9 MEDIUM 5% exploit odds Fix listed

What it is

An authentication brute-force protection mechanism bypass in telnetd in D-Link Router model DIR-842 firmware version 3.0.2 allows a remote attacker to circumvent the anti-brute-force cool-down delay period via a timing-based side-channel attack

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data tampering.
Exploit odds: 4.6% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-05-17 13:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:44 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 4.6% in the next 30 days (EPSS).
Severity: 5.9 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-05-17 13:15 UTC
Last modified: 2026-06-17 03:44 UTC
Exploit probability: 4.6% · EPSS, next 30 days
Weakness: CWE-203
Record status: Modified

Affected

Dlink dir-842e Firmware ≤ 3.0.2

Attack profile CVSS 3.1 · 5.9

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: None

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-27342.md and follow it. Check whether this project is affected by CVE-2021-27342. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

· More options · Status badge

Download Square Reddit

Fix and advisories

References

NVD record · CVE.org record