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CVE-2020-3926

24
FAUCET Score

CVE-2020-3926 is an arbitrary file access vulnerability in the ServiSign security plugin, affecting Changingtec ServiSign for Windows and Microsoft ServiSign for Windows. Attackers can exploit this by learning a specific API function and crafting API parameters to access arbitrary files on a target system. This vulnerability has a CVSS score of 7.5 (High) due to its network-based attack vector, low attack complexity, and high confidentiality impact, with no user interaction required. There is currently no public exploit code available, no evidence of active exploitation, and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.0.19.0617CPE matchmatch criteria
cpe:2.3:a:changingtec:servisign:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.6
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.48%
Probability of exploitation in next 30 days
EPSS Percentile
71.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0148 is in the 53rd percentile among its peer group of 51,485 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

tvn.twcert.org.tw / taiwanvn/TVN-201910006
Third Party Advisory
chtsecurity.com / news/1179d48b-7609-4f67-9d7e-3bac2979c6ce
Third Party Advisory