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CVE-2018-20439

29
FAUCET Score

CVE-2018-20439 is a critical vulnerability affecting Technicolor DPC3928SL devices and their firmware, allowing remote attackers to discover Wi-Fi credentials via specific SNMP requests. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with no authentication required, leading to a complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered some community discussion. Organizations using affected Technicolor devices should prioritize patching or implementing mitigation strategies to prevent credential exposure.

Impacted Technologies

VendorProductVersion(s)CPE
d3928sl-psip-13-a010-c3420r55105-170214aCPE matchmatch criteria
cpe:2.3:o:technicolor:dpc3928sl_firmware:d3928sl-psip-13-a010-c3420r55105-170214a:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/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
3.0

Exploit Intelligence

EPSS Score
1.29%
Probability of exploitation in next 30 days
EPSS Percentile
67.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0129 is in the 54th percentile among its peer group of 36,833 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

misteralfa-hack.blogspot.com / 2018/12/technicolor-passwords-wireless-via-snmp.html
Third Party Advisory