CVE-2021-28839

Public Exploit

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.56%
Vendor Advisory dlink.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://www.dlink.com/en/security-bulletin/ vendor advisory
https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf third party advisory exploit
https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-28839?
CVE-2021-28839 has been scored as a high severity vulnerability.
How to fix CVE-2021-28839?
To fix CVE-2021-28839, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-28839 being actively exploited in the wild?
It is possible that CVE-2021-28839 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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