CVE-2025-47779: Asterisk is an open-source private branch exchange (PBX)

Q: How do I fix CVE-2025-47779?

asterisk: upgrade to 18.26.2, 20.14.1, 21.9.1, 22.4.1; certified asterisk: upgrade to 18.9. Exact commands for each OS are on this page.

Q: Is CVE-2025-47779 being exploited?

CVE-2025-47779 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-47779 affect?

CVE-2025-47779 affects asterisk, certified asterisk. Severity is high (CVSS 7.7). Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk, SIP requests of the type MESSAGE (RFC 3428) authenti

Q: How urgent is CVE-2025-47779?

Priority 43/100. High severity; Public exploit reference

This month

HIGH 7.7UPGRADEUPGRADE

CVE-2025-47779 is a high-severity flaw (CVSS 7.7) affecting asterisk, certified asterisk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk, SIP requests of the type MESSAGE (RFC 3428) authentication do not get proper alignment. An authenticated attacker can spoof any user identity to send spam messages to the user with their authorization token. Abuse of this security issue allows authenticated atta

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-140, CWE-792
Published	2025-05-22
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: sangoma

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-22 17:15 UTCPublished CVE record published
2026-06-17 09:28 UTCUpdated Record last modified

sangoma asterisk UPGRADE

Affected: < 18.26.2 · >= 20.0.0 and < 20.14.1 · >= 21.0.0 and < 21.9.1 · >= 22.0.0 and < 22.4.1

Fixed in: 18.26.2, 20.14.1, 21.9.1, 22.4.1

Safe to downgrade to: a release before 20.0.0

1. Check installed version

apt-cache policy asterisk || rpm -q asterisk || asterisk --version

2. UPGRADE to 18.26.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade asterisk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade asterisk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 20.0.0 (Debian / Ubuntu)

apt-cache madison asterisk sudo apt install asterisk=<VERSION_BEFORE_20.0.0> sudo apt-mark hold asterisk

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list asterisk sudo dnf downgrade asterisk-<VERSION_BEFORE_20.0.0> sudo dnf versionlock add asterisk

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

sangoma certified asterisk UPGRADE

Affected: < 18.9 · 18.9 · 18.9 cert1 · 18.9 cert1-rc1 · 18.9 cert10 · 18.9 cert11 · 18.9 cert12 · 18.9 cert13

Fixed in: 18.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy certified-asterisk || rpm -q certified-asterisk || certified-asterisk --version

2. UPGRADE to 18.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade certified-asterisk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade certified-asterisk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-47779?

asterisk: upgrade to 18.26.2, 20.14.1, 21.9.1, 22.4.1; certified asterisk: upgrade to 18.9. Exact commands for each OS are on this page.

Is CVE-2025-47779 being exploited?

CVE-2025-47779 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-47779 affect?

CVE-2025-47779 affects asterisk, certified asterisk. Severity is high (CVSS 7.7). Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk, SIP requests of the type MESSAGE (RFC 3428) authenti

How urgent is CVE-2025-47779?

Priority 43/100. High severity; Public exploit reference

Related CVEs

CVE-2025-1131 HIGH 7.8 UPGRADE DOWNGRADE A local privilege escalation vulnerability exists in the safe_asterisk script included with the Asterisk toolk
CVE-2026-23741 NONE 0.0 UPGRADE UPGRADE Asterisk is an open source private branch exchange and telephony toolkit
CVE-2026-23740 NONE 0.0 DOWNGRADE UPGRADE Asterisk is an open source private branch exchange and telephony toolkit
CVE-2026-23739 LOW 2.0 UPGRADE UPGRADE Asterisk is an open source private branch exchange and telephony toolkit
CVE-2026-23738 LOW 3.5 UPGRADE UPGRADE Asterisk is an open source private branch exchange and telephony toolkit

References

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