CVE-2021-25376: An improper synchronization logic in Samsung Email prior to version 6.1.41.0 can leak messages in certain mail

Q: How do I fix CVE-2021-25376?

email: upgrade to 6.1.41.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-25376 being exploited?

CVE-2021-25376 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-25376 affect?

CVE-2021-25376 affects email. Severity is low (CVSS 3.1). An improper synchronization logic in Samsung Email prior to version 6.1.41.0 can leak messages in certain mailbox in plain text when STARTTLS negotiation is failed.

Q: How urgent is CVE-2021-25376?

Priority 25/100. No elevated risk signals yet.

Routine

LOW 3.1UPGRADE

CVE-2021-25376 is a low-severity flaw (CVSS 3.1) affecting email. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An improper synchronization logic in Samsung Email prior to version 6.1.41.0 can leak messages in certain mailbox in plain text when STARTTLS negotiation is failed.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-200, CWE-662
Published	2021-04-09
Last modified	2026-06-17

Publisher (CNA): Samsung Mobile · Vendor: samsung

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-04-09 18:15 UTCPublished CVE record published
2026-06-17 03:41 UTCUpdated Record last modified

samsung email UPGRADE

Affected: < 6.1.41.0

Fixed in: 6.1.41.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy email || rpm -q email || email --version

2. UPGRADE to 6.1.41.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade email

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade email

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-25376?

email: upgrade to 6.1.41.0. Exact commands for each OS are on this page.

Is CVE-2021-25376 being exploited?

CVE-2021-25376 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-25376 affect?

CVE-2021-25376 affects email. Severity is low (CVSS 3.1). An improper synchronization logic in Samsung Email prior to version 6.1.41.0 can leak messages in certain mailbox in plain text when STARTTLS negotiation is failed.

How urgent is CVE-2021-25376?

Priority 25/100. No elevated risk signals yet.

Software pages

Samsung vulnerabilities

Related CVEs

CVE-2025-21077 LOW 3.3 UPGRADE Improper input validation in Samsung Email prior to version 6.2.06.0 allows local attackers to launch arbitrar
CVE-2024-34636 MEDIUM 4.0 UPGRADE Use of implicit intent for sensitive communication in Samsung Email prior to version 6.1.94.2 allows local att
CVE-2024-20867 MEDIUM 5.5 UPGRADE Improper privilege management vulnerability in Samsung Email prior to version 6.1.91.14 allows local attackers
CVE-2024-20807 LOW 3.3 UPGRADE Implicit intent hijacking vulnerability in Samsung Email prior to version 6.1.90.16 allows local attacker to g
CVE-2023-42553 MEDIUM 4.0 UPGRADE Improper authorization verification vulnerability in Samsung Email prior to version 6.1.90.4 allows attackers

References

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