CVE-2021-20133

highpriority · track · 25EPSS 0.021 · 82 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

2.14% (82nd) EPSS

CVSS 7.1 · high

Is it mine?

2 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

Quagga 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 remote, authenticated attacker to set the "message of the day" banner to any file on the system, allowing them to read all or some of the contents of those files. Such sensitive information as hashed credentials, hardcoded plaintext passwords for other services, configuration files, and private keys can be disclosed in this fashion. Improper handling of filenames that identify virtual resources, such as "/dev/urandom" allows an attacker to effect a denial of service attack against the command line interfaces of the Quagga services (zebra and ripd).

cvss

Technical severity, 0–10. One row per scoring source.

7.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.6–7.1

v2.07.1highAV:A/AC:L/Au:S/C:C/I:N/A:Cprimary · NVD / NIST USexploitability 5.1 · impact 9.2

v3.16.1mediumCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:Hprimary · NVD / NIST USexploitability 0.9 · impact 5.2

v3.15.6mediumCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-22USprimary

affected products (2)

Products and version ranges known to be affected.

n/a Quagga Services on D-Link DIR-2640 Routers≤ ≤ 1.11B02enisa_euvdEU
dlink dir-2640-us firmware≤ 1.11b02nvdUScpe:2.3:o:dlink:dir-2640-us_firmware:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-12-30modified 2026-06-17

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+12544 more

references (4)

External citations — patches, advisories, analysis.

scry

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