Vulnerability · Published Aug 10, 2021 · Assigned by mitre

CVE-2021-28839

High 7.5

In plain English

A high-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities).

Severity (CVSS NVD)7.5High

Exploit odds (30 days)1.4%top 27.8% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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 products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

References

https://www.dlink.com/en/security-bulletin/ x_refsource_MISC
https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf x_refsource_MISC
https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf x_refsource_MISC