How severe is CVE-2019-18377?

CVE-2019-18377 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-18377 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18377?

CVE-2019-18377 affects Symantec Messaging Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-18377?

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-2019-18377 published?

CVE-2019-18377 was published on 2019-12-11 and last updated on 2026-06-17.

CVE-2019-18377

CVE-2019-18377 is a high-severity vulnerability in Symantec Messaging Gateway with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Symantec Messaging Gateway
Published: 2019-12-11
Last modified: 2026-06-17

Description

Symantec Messaging Gateway, prior to 10.7.3, may be susceptible to a privilege escalation vulnerability, which is a type of issue whereby an attacker may attempt to compromise the software application to gain elevated access to resources that are normally protected from an application or user.

Frequently asked questions

What is CVE-2019-18377?: Symantec Messaging Gateway, prior to 10.7.3, may be susceptible to a privilege escalation vulnerability, which is a type of issue whereby an attacker may attempt to compromise the software application to gain elevated access to resources that are normally protected from an application or user.
How severe is CVE-2019-18377?: CVE-2019-18377 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-18377 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18377?: CVE-2019-18377 affects Symantec Messaging Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-18377?: 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-2019-18377 published?: CVE-2019-18377 was published on 2019-12-11 and last updated on 2026-06-17.

References

https://support.symantec.com/us/en/article.SYMSA1501.html

Affected products (1)

cpe:2.3:a:symantec:messaging_gateway:*:*:*:*:*:*:*:*

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