How severe is CVE-2021-36513?

CVE-2021-36513 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 high, integrity none, and availability none.

Is CVE-2021-36513 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36513?

CVE-2021-36513 affects Signalwire Freeswitch. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36513?

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-2021-36513 published?

CVE-2021-36513 was published on 2021-10-18 and last updated on 2026-06-17.

CVE-2021-36513

CVE-2021-36513 is a high-severity vulnerability in Signalwire Freeswitch 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-909.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-909
Affected product: Signalwire Freeswitch
Published: 2021-10-18
Last modified: 2026-06-17

Description

An issue was discovered in function sofia_handle_sip_i_notify in sofia.c in SignalWire freeswitch before 1.10.6, may allow attackers to view sensitive information due to an uninitialized value.

Frequently asked questions

What is CVE-2021-36513?: An issue was discovered in function sofia_handle_sip_i_notify in sofia.c in SignalWire freeswitch before 1.10.6, may allow attackers to view sensitive information due to an uninitialized value.
How severe is CVE-2021-36513?: CVE-2021-36513 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 high, integrity none, and availability none.
Is CVE-2021-36513 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36513?: CVE-2021-36513 affects Signalwire Freeswitch. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36513?: 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-2021-36513 published?: CVE-2021-36513 was published on 2021-10-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:signalwire:freeswitch:*:*:*:*:*:*:*:*

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