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Vulnerability record · CVE-2021-20132 · published 30 December 2021

CVE-2021-20132: Dlink dir-2640-us firmware hard-coded credentials vulnerability

Dlink · Dir 2640 Us Firmware

Quagga 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 gain administrative access to the zebra or ripd those services. Both are running with root privileges on the router (i.e., as the "admin" user, UID 0).

8.8 CVSS 3.1 High EPSS 4.3% · top 9.2% CWE-798 · Hard-coded credentials
8.8CVSS 3.1 base score, v2 8.3
4.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Quagga 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 gain administrative access to the zebra or ripd those services. Both are running with root privileges on the router (i.e., as the "admin" user, UID 0).

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

Affected products

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

References

LinkTags
https://www.tenable.com/security/research/tra-2021-44 ExploitThird Party Advisory
https://www.tenable.com/security/research/tra-2021-44 ExploitThird Party Advisory

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Related vulnerabilities

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

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%7.1CVE-2021-34201Dlink dir-2640-us firmware out-of-bounds write vulnerabilityD-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-…EPSS 0.54%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%10.0CVE-2026-22769Dell RecoverPoint for Virtual Machines hardcoded credential flawDell RecoverPoint for Virtual Machines versions prior to 6.0.3.1 HF1 contain a hardcoded credential vulnerability (CWE-798). An unauthenticated remot…KEVEPSS 13%analysed7.1CVE-2025-14611Gladinet CentreStack and Triofox hardcoded AES key enables file inclusionCentreStack and Triofox before 16.12.10420.56791 use hardcoded values in their AES cryptoscheme, weakening protection for publicly exposed endpoints.…KEVEPSS 53%analysed

Source: NIST National Vulnerability Database (record CVE-2021-20132), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.