← Vulnerability feed

Vulnerability record · CVE-2021-34201 · published 16 June 2021

CVE-2021-34201: Dlink dir-2640-us firmware out-of-bounds write vulnerability

Dlink · Dir 2640 Us Firmware

D-Link DIR-2640-US 1.01B04 is vulnerable to Buffer Overflow. There are multiple out-of-bounds vulnerabilities in some processes of D-Link AC2600(DIR-2640). Local ordinary users can overwrite the global variables in the .bss section, causing the process crashes or changes.

7.1 CVSS 3.1 High EPSS 0.54% · top 56.9% CWE-787 · Out-of-bounds write
7.1CVSS 3.1 base score, v2 3.6
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
9 Jul 2026Last modified by NVD

Description

D-Link DIR-2640-US 1.01B04 is vulnerable to Buffer Overflow. There are multiple out-of-bounds vulnerabilities in some processes of D-Link AC2600(DIR-2640). Local ordinary users can overwrite the global variables in the .bss section, causing the process crashes or changes.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34201 ExploitThird Party Advisory
https://www.dlink.com/en/security-bulletin/ Vendor Advisory
https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34201 ExploitThird Party Advisory
https://www.dlink.com/en/security-bulletin/ Vendor Advisory

Track CVE-2021-34201 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2021-20132Dlink dir-2640-us firmware hard-coded credentials vulnerabilityQuagga Services on D-Link DIR-2640 less than or equal to version 1.11B02 use default hard-coded credentials, which can allow a remote attacker to gai…EPSS 4.3%8.4CVE-2021-20134Dlink dir-2640-us firmware path traversal vulnerabilityQuagga Services on D-Link DIR-2640 less than or equal to version 1.11B02 are affected by an absolute path traversal vulnerability that allows a remot…EPSS 7.5%8.1CVE-2021-34203Dlink dir-2640-us firmware insecure default initialization vulnerabilityD-Link DIR-2640-US 1.01B04 is vulnerable to Incorrect Access Control. Router ac2600 (dir-2640-us), when setting PPPoE, will start quagga process in t…EPSS 1.2%7.8CVE-2021-34202Dlink dir-2640-us firmware out-of-bounds write vulnerabilityThere are multiple out-of-bounds vulnerabilities in some processes of D-Link AC2600(DIR-2640) 1.01B04. Ordinary permissions can be elevated to admini…EPSS 3.6%6.8CVE-2021-34204Dlink dir-2640-us firmware insufficiently protected credentials vulnerabilityD-Link DIR-2640-US 1.01B04 is affected by Insufficiently Protected Credentials. D-Link AC2600(DIR-2640) stores the device system account password in …EPSS 1.1%6.1CVE-2021-20133Dlink dir-2640-us firmware path traversal vulnerabilityQuagga Services on D-Link DIR-2640 less than or equal to version 1.11B02 are affected by an absolute path traversal vulnerability that allows a remot…EPSS 2.1%8.8CVE-2026-53266Linux kernel ebtables SNAT out-of-bounds write in ARP rewriteThe ebtables SNAT target rewrites the ARP sender hardware address via skb_store_bits() without first making that range writable. When the ARP SHA byt…KEVEPSS 0.65%analysed8.8CVE-2026-87491Google Chrome V8 out-of-bounds write enables sandbox code executionChrome before 153.0.8010.36 contains an out-of-bounds write in the V8 JavaScript engine. A crafted HTML page can trigger the memory corruption, and b…KEVEPSS 3.1%analysed

Source: NIST National Vulnerability Database (record CVE-2021-34201), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.