How severe is CVE-2020-35652?

CVE-2020-35652 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-35652 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35652?

CVE-2020-35652 affects Digium Asterisk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35652?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-35652 published?

CVE-2020-35652 was published on 2021-01-29 and last updated on 2026-06-17.

CVE-2020-35652

CVE-2020-35652 is a medium-severity vulnerability in Digium Asterisk with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Digium Asterisk
Published: 2021-01-29
Last modified: 2026-06-17

Description

An issue was discovered in res_pjsip_diversion.c in Sangoma Asterisk before 13.38.0, 14.x through 16.x before 16.15.0, 17.x before 17.9.0, and 18.x before 18.1.0. A crash can occur when a SIP message is received with a History-Info header that contains a tel-uri, or when a SIP 181 response is received that contains a tel-uri in the Diversion header.

Frequently asked questions

What is CVE-2020-35652?: An issue was discovered in res_pjsip_diversion.c in Sangoma Asterisk before 13.38.0, 14.x through 16.x before 16.15.0, 17.x before 17.9.0, and 18.x before 18.1.0. A crash can occur when a SIP message is received with a History-Info header that contains a tel-uri, or when a SIP 181 response is received that contains a tel-uri in the Diversion header.
How severe is CVE-2020-35652?: CVE-2020-35652 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-35652 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35652?: CVE-2020-35652 affects Digium Asterisk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35652?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-35652 published?: CVE-2020-35652 was published on 2021-01-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*

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