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CVE-2021-43270

23
FAUCET Score

CVE-2021-43270 describes a vulnerability in Datalust Seq.App.EmailPlus versions 3.1.0-dev-00148, 3.1.0-dev-00170, and 3.1.0-dev-00176, where the application may default to cleartext SMTP on port 25 even when secure communication via port 465 was intended. This unencrypted transmission of email data could lead to sensitive information disclosure. Rated with a CVSS score of 7.5 (HIGH), this vulnerability is remotely exploitable with low attack complexity and no user interaction required, potentially allowing an attacker to intercept confidential information. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.1.0CPE matchmatch criteria
cpe:2.3:a:datalust:seq.app.emailplus:3.1.0:dev-00148:*:*:*:*:*:*
3.1.0CPE matchmatch criteria
cpe:2.3:a:datalust:seq.app.emailplus:3.1.0:dev-00170:*:*:*:*:*:*
3.1.0CPE matchmatch criteria
cpe:2.3:a:datalust:seq.app.emailplus:3.1.0:dev-00176:*:*:*:*:*:*

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:H/I:N/A:N

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

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 10th 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

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / datalust/seq-app-htmlemail/pull/93
PatchThird Party Advisory