How severe is CVE-2025-57767?

CVE-2025-57767 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-2025-57767 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-57767?

CVE-2025-57767 affects Sangoma Asterisk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-57767?

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.

Does CVE-2025-57767 have an EU (EUVD) identifier?

Yes. CVE-2025-57767 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26117.

When was CVE-2025-57767 published?

CVE-2025-57767 was published on 2025-08-28 and last updated on 2026-06-17.

CVE-2025-57767

CVE-2025-57767 is a high-severity vulnerability in Sangoma 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-253.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-26117
Weakness: CWE-253
Affected product: Sangoma Asterisk
Published: 2025-08-28
Last modified: 2026-06-17

Description

Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.15.2, 21.10.2, and 22.5.2, if a SIP request is received with an Authorization header that contains a realm that wasn't in a previous 401 response's WWW-Authenticate header, or an Authorization header with an incorrect realm was received without a previous 401 response being sent, the get_authorization_header() function in res_pjsip_authenticator_digest will return a NULL. This wasn't being checked before attempting to get the digest algorithm from the header which causes a SEGV. This issue has been patched in versions 20.15.2, 21.10.2, and 22.5.2. There are no workarounds.

Frequently asked questions

What is CVE-2025-57767?: Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.15.2, 21.10.2, and 22.5.2, if a SIP request is received with an Authorization header that contains a realm that wasn't in a previous 401 response's WWW-Authenticate header, or an Authorization header with an incorrect realm was received without a previous 401 response being sent, the get_authorization_header() function in res_pjsip_authenticator_digest will return a NULL. This wasn't being checked before attempting to get the digest algorithm from the header which causes a SEGV. This issue has been patched in versions 20.15.2, 21.10.2, and 22.5.2. There are no workarounds.
How severe is CVE-2025-57767?: CVE-2025-57767 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-2025-57767 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-57767?: CVE-2025-57767 affects Sangoma Asterisk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-57767?: 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.
Does CVE-2025-57767 have an EU (EUVD) identifier?: Yes. CVE-2025-57767 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26117.
When was CVE-2025-57767 published?: CVE-2025-57767 was published on 2025-08-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*

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