10

CVE-2021-21820: dlink dir-3040_firmware Use of Hard-coded Credentials

CVSS: 10.0v3.0CriticalModified
Published 16-07-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-21820 is a critical (CVSS 10.0) Use of Hard-coded Credentials vulnerability in dlink dir-3040_firmware. EPSS estimates a 2.96% chance of exploitation in the next 30 days, higher than 87% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
90/100
0100
Critical · default modelHow is this calculated?
CVSS score
10.0/10
010
Critical · v3.0 (CVE.org)
EPSS score
2.96%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 16-07-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

A hard-coded password vulnerability exists in the Libcli Test Environment functionality of D-LINK DIR-3040 1.13B03. A specially crafted network request can lead to code execution. An attacker can send a sequence of requests to trigger this vulnerability.

CVSS metrics

4 scores · 2 sources · 3 versions

EPSS trend

Probability

2.96%

Chance of exploitation in the next 30 days

Percentile

87%

Versus all other CVEs

30-day change

0.00 pp

From 2.96% on 20-09-2026

20-09-202620-10-2026
EPSS score
2.96%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (talosintelligence.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Dlink1 product

1 vendor · 1 product

References

1 links