How severe is CVE-2018-13296?

CVE-2018-13296 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-13296 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-13296?

CVE-2018-13296 affects Synology Mailplus Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-13296?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-13296 published?

CVE-2018-13296 was published on 2019-04-01 and last updated on 2026-06-17.

CVE-2018-13296

CVE-2018-13296 is a high-severity vulnerability in Synology Mailplus Server with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Synology Mailplus Server
Published: 2019-04-01
Last modified: 2026-06-17

Description

Uncontrolled resource consumption vulnerability in TLS configuration in Synology MailPlus Server before 2.0.5-0606 allows remote attackers to conduct denial-of-service attacks via client-initiated renegotiation.

Frequently asked questions

What is CVE-2018-13296?: Uncontrolled resource consumption vulnerability in TLS configuration in Synology MailPlus Server before 2.0.5-0606 allows remote attackers to conduct denial-of-service attacks via client-initiated renegotiation.
How severe is CVE-2018-13296?: CVE-2018-13296 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-13296 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-13296?: CVE-2018-13296 affects Synology Mailplus Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-13296?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-13296 published?: CVE-2018-13296 was published on 2019-04-01 and last updated on 2026-06-17.

References

https://www.synology.com/security/advisory/Synology_SA_18_43

Affected products (1)

cpe:2.3:a:synology:mailplus_server:*:*:*:*:*:*:*:*

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