Is CVE-2025-59028 in the CISA KEV catalog?

No. CVE-2025-59028 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-59028?

CVE-2025-59028 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2025-59028?

CVE-2025-59028 has an EPSS score of 0.45% (36th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-59028?

Upgrade dovecot on debian 13 to 1:2.4.1+dfsg1-6+deb13u4 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2025-59028

MEDIUM

5.3

CVSS v3

NVD

Description

When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments). No publicly available exploits are known.

CWE-20Improper Input Validation

How to fix

Remediation Available

dovecotDebian

Fixed in:1:2.4.1+dfsg1-6+deb13u4CVE-2025-59028

Fixed in:1:2.4.3+dfsg1-1CVE-2025-59028

dovecotUbuntu

Fixed in:1:2.3.16+dfsg1-3ubuntu2.7USN-8136-1

Fixed in:1:2.3.21+dfsg1-2ubuntu6.3USN-8136-1

Fixed in:1:2.4.1+dfsg1-5ubuntu4.1USN-8136-1

dovecot-coreUbuntu

Fixed in:1:2.3.16+dfsg1-3ubuntu2.7USN-8136-1

Fixed in:1:2.3.21+dfsg1-2ubuntu6.3USN-8136-1

Fixed in:1:2.4.1+dfsg1-5ubuntu4.1USN-8136-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.45%probability of exploitation in 30 days

36thpercentile

Low risk: more likely to be exploited than 36% of all known CVEs.

References

Vendor Advisory1

documentation.open-xchange.com

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-30.