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CVE-2021-20133

22
FAUCET Score

CVE-2021-20133 is an absolute path traversal vulnerability affecting Quagga Services on D-Link DIR-2640 routers running firmware version 1.11B02 or earlier. A remote, authenticated attacker can exploit this to read sensitive system files, including hashed credentials and private keys, or cause a denial of service. The vulnerability has a CVSS score of 6.1 (Medium) and requires high privileges and network access for exploitation. There is no public exploit code, evidence of active exploitation, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.11b02CPE matchmatch criteria
cpe:2.3:o:dlink:dir-2640-us_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
0.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.08%
Probability of exploitation in next 30 days
EPSS Percentile
79.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0208 is in the 94th percentile among its peer group of 399 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (5)

asteriskvendor investigatingvia llm_extracted
ciscovendor investigatingvia llm_extracted
miniovendor investigatingvia llm_extracted
opensshvendor investigatingvia llm_extracted
railsvendor investigatingvia llm_extracted

Vendor Advisories (5)

opensshllm-openssh-87dcea0097525c99HIGH

Critical Vulnerabilities on the D-Link DIR-2640 Router

Oct 19, 2021
railsllm-rails-486cd415774a802cHIGH

Critical Vulnerabilities on the D-Link DIR-2640 Router

Oct 19, 2021
miniollm-minio-16563aa65dea5f34HIGH

Critical Vulnerabilities on the D-Link DIR-2640 Router

Oct 19, 2021
ciscollm-cisco-48484d23210b67fcHIGH

Critical Vulnerabilities on the D-Link DIR-2640 Router

Oct 19, 2021
asteriskllm-asterisk-3258a40a5f11dd6eHIGH

Critical Vulnerabilities on the D-Link DIR-2640 Router

Oct 19, 2021

References

tenable.com / security/research/tra-2021-44
ExploitThird Party Advisory