Hard-coded credentials in D-Link
Priority MEDIUM 47CWE-798Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-798.
Summary
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.
Why it matters now
EPSS 0.02962 87th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | D-Link | D-LINK DIR-3040 1.13B03 | — | No fix listed | CNA |
- D-Link Vendor— Affected D-LINK DIR-3040 1.13B03 Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:dlink:dir-3040_firmware:1.13b03:*:*:*:*:*:*:* | 1.13b03 | Vulnerable | D-Link Japan K.K. |
| cpe:2.3:h:dlink:dir-3040:-:*:*:*:*:*:*:* | not specified by NVD | Running on | D-Link Japan K.K. |
- cpe:2.3:o:dlink:dir-3040_firmware:1.13b03:*:*:*:*:*:*:* Versions 1.13b03 Vulnerable ·D-Link Japan K.K.
- cpe:2.3:h:dlink:dir-3040:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·D-Link Japan K.K.
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-21820
- 2026-10-03 Alias added: GHSA-gmq9-r2m4-2qvg
References
More D-Link Japan K.K. Dir-3040 Firmware vulnerabilities
- TI-2022-22070 D-Link DIR-3040 device with firmware 120B03 was discovered to contain a command injection… CVSS 3.1CRITICAL 9.8
- TI-2021-04958 Hard-coded credentials in D-Link CVSS 3.1CRITICAL 9.8
- TI-2021-04861 Information disclosure in D-LINK CVSS 3.1MEDIUM 4.3
- TI-2023-21839 Stack-based buffer overflow in D-Link DIR-3040 CVSS 3.1HIGH 8.8
- TI-2023-21838 Heap-based buffer overflow in D-Link DIR-3040 CVSS 3.1HIGH 8.8
- TI-2022-21416 Heap-based buffer overflow in D-Link DIR-3040 CVSS 3.1HIGH 8.8
Sources
- CVE-2021-21820 · CVE Program
- CVE-2021-21820 · NVD
- FIRST EPSS
- GHSA-gmq9-r2m4-2qvg · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences