How severe is CVE-2018-19278?

CVE-2018-19278 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-2018-19278 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-19278?

CVE-2018-19278 primarily affects Digium Asterisk. In total, 30 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-19278?

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-2018-19278 published?

CVE-2018-19278 was published on 2018-11-14 and last updated on 2026-06-17.

CVE-2018-19278

CVE-2018-19278 is a high-severity vulnerability in Digium Asterisk 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-119.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Digium Asterisk
Published: 2018-11-14
Last modified: 2026-06-17

Description

Buffer overflow in DNS SRV and NAPTR lookups in Digium Asterisk 15.x before 15.6.2 and 16.x before 16.0.1 allows remote attackers to crash Asterisk via a specially crafted DNS SRV or NAPTR response, because a buffer size is supposed to match an expanded length but actually matches a compressed length.

Frequently asked questions

What is CVE-2018-19278?: Buffer overflow in DNS SRV and NAPTR lookups in Digium Asterisk 15.x before 15.6.2 and 16.x before 16.0.1 allows remote attackers to crash Asterisk via a specially crafted DNS SRV or NAPTR response, because a buffer size is supposed to match an expanded length but actually matches a compressed length.
How severe is CVE-2018-19278?: CVE-2018-19278 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-2018-19278 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-19278?: CVE-2018-19278 primarily affects Digium Asterisk. In total, 30 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-19278?: 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-2018-19278 published?: CVE-2018-19278 was published on 2018-11-14 and last updated on 2026-06-17.

References

Affected products (30)

cpe:2.3:a:digium:asterisk:15.0.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.0.0:b1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.1.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.1.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.1.0:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.1.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.1.3:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.1.4:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.1.5:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.2.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.2.0:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.2.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.2.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.3.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.3.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.3.0:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.4.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.4.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.4.0:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.4.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.5.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.5.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.6.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.6.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:15.6.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:16.0.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:16.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:16.0.0:rc3:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:16.0.1:rc1:*:*:*:*:*:*

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