CVE-2021-28839

Published: Aug 10, 2021Modified: Jun 17, 2026

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: NVD

Description

Null Pointer Dereference vulnerability exists in D-Link DAP-2310 2.07.RC031, DAP-2330 1.07.RC028, DAP-2360 2.07.RC043, DAP-2553 3.06.RC027, DAP-2660 1.13.RC074, DAP-2690 3.16.RC100, DAP-2695 1.17.RC063, DAP-3320 1.01.RC014 and DAP-3662 1.01.RC022 in the upload_certificate function of sbin/httpd binary. When the binary handle the specific HTTP GET request, the strrchr in the upload_certificate function would take NULL as first argument, and incur the NULL pointer dereference vulnerability.

Affected (9)

Products: Dlink: Dap 2310 Firmware, Dap 2330 Firmware, Dap 2360 Firmware, Dap 2553 Firmware, Dap 2660 Firmware, Dap 2690 Firmware, Dap 2695 Firmware, Dap 3320 Firmware, Dap 3662 Firmware

9 products

Configuration A

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Dlink Dap 2310 Firmware	Version 2.0.7.rc031

Running on/with	Platform Versions
Dlink Dap 2310	All versions

Configuration B

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Dlink Dap 2330 Firmware	Version 1.07.rc028

Running on/with	Platform Versions
Dlink Dap 2330	All versions

Configuration C

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Dlink Dap 2360 Firmware	Version 2.07.rc043

Running on/with	Platform Versions
Dlink Dap 2360	All versions

Configuration D

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Dlink Dap 2553 Firmware	Version 3.06.rc027

Running on/with	Platform Versions
Dlink Dap 2553	All versions

Configuration E

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Dlink Dap 2660 Firmware	Version 1.13.rc074

Running on/with	Platform Versions
Dlink Dap 2660	All versions

Configuration F

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Dlink Dap 2690 Firmware	Version 3.16.rc100

Running on/with	Platform Versions
Dlink Dap 2690	All versions

Configuration G

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Dlink Dap 2695 Firmware	Version 1.17.rc063

Running on/with	Platform Versions
Dlink Dap 2695	All versions

Configuration H

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Dlink Dap 3320 Firmware	Version 1.01.rc014

Running on/with	Platform Versions
Dlink Dap 3320	All versions

Configuration I

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Dlink Dap 3662 Firmware	Version 1.01.rc022

Running on/with	Platform Versions
Dlink Dap 3662	All versions

Related CWEs

CWE-476

NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

References (6)

https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf

Source: cve@mitre.org

ExploitThird Party Advisory

https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf

Source: cve@mitre.org

Third Party Advisory

https://www.dlink.com/en/security-bulletin/

Source: cve@mitre.org

Vendor Advisory

https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitThird Party Advisory

https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://www.dlink.com/en/security-bulletin/

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

Timeline

No history available yet.