CVE-2021-34830

Name: CVE-2021-34830
Creator: NVD / NIST
Published: 2021-07-15T18:15:09.593+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.33%

Last modified Jun 17, 2026

CVE-2021-34830 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-1330 1.13B01 BETA routers. Authentication is not required to exploit this vulnerability. EPSS estimates a 2.33% chance of exploitation in the next 30 days.

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-1330 1.13B01 BETA routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the Cookie HTTP header. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the device. Was ZDI-CAN-12028.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

2.33%

81.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-121

Affected Software

Vendor	Product	Versions	Update
Dlink	Dap-1330 Firmware	1.13b01	Beta

References

https://www.zerodayinitiative.com/advisories/ZDI-21-682/Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-682/Third Party Advisory, VDB Entry

Timeline

Published: Jul 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34830?

How severe is CVE-2021-34830?

CVE-2021-34830 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.33% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34830?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34830?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST