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CVE-2020-9544

24
FAUCET Score

CVE-2020-9544 is a high-severity authentication bypass vulnerability affecting D-Link DSL-2640B E1 EU_1.01 devices. The administrative interface fails to authenticate firmware update requests, allowing an unauthenticated attacker with network access to install arbitrary firmware. This could lead to a complete compromise of the device. While the CVSS score is 7.5 (HIGH), there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
e1_eu_1.01CPE matchmatch criteria
cpe:2.3:o:d-link:dsl-2640b_firmware:e1_eu_1.01:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.36%
Probability of exploitation in next 30 days
EPSS Percentile
68.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0136 is in the 49th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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

Remediation records are not available for this CVE.

References

ktln2.org / 2020/03/05/cve-2020-9544
ExploitThird Party Advisory
dlink.com / en/security-bulletin
Vendor Advisory