Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2021-26709

50
FAUCET Score

CVE-2021-26709 describes multiple stack-based buffer overflows in D-Link DSL-320B-D1 devices up to firmware EU_1.25, allowing unauthenticated remote attackers to gain full control of the device by manipulating the login.xgi user and pass parameters. This vulnerability carries a critical CVSS score of 9.8 due to its network-based attack vector, low attack complexity, and complete compromise of confidentiality, integrity, and availability. While the vulnerability is severe and has a high EPSS score, there is currently no public exploit code available (Metasploit, Nuclei, ExploitDB), and it shows no signs of active exploitation or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
<= eu_1.25CPE matchmatch criteria
cpe:2.3:o:d-link:dsl-320b-d1:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
40.08%
Probability of exploitation in next 30 days
EPSS Percentile
98.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.4008 is in the 96th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/162133/D-Link-DSL-320B-D1-Pre-Authentication-Buffer-Overflow.html
ExploitThird Party AdvisoryVDB Entry
seclists.org / fulldisclosure/2021/Apr/15
Mailing ListThird Party Advisory
supportannouncement.us.dlink.com / announcement/publication.aspx
Vendor Advisory
dlink.com / en/security-bulletin
Vendor Advisory