Free and open · new CVEs checked every 20 minutesStatusRSSOpen dataContact

CVE-2009-2346: The IAX2 protocol implementation in Asterisk Open Source 1.2.x before 1.2.35, 1.4.x before 1.4.26.2, 1.6.0.x b

49
This month
HIGH 7.8DOWNGRADEDOWNGRADEDOWNGRADE

CVE-2009-2346 is a high-severity flaw (CVSS 7.8) affecting asterisk, open source, opensource. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The IAX2 protocol implementation in Asterisk Open Source 1.2.x before 1.2.35, 1.4.x before 1.4.26.2, 1.6.0.x before 1.6.0.15, and 1.6.1.x before 1.6.1.6; Business Edition B.x.x before B.2.5.10, C.2.x before C.2.4.3, and C.3.x before C.3.1.1; and s800i 1.3.x before 1.3.0.3 allows remote attackers to cause a denial of service (call-number exhaustion) by initiating many IAX2 message exchanges, a related issue to CVE-2008-3263.

Why this priority

  • High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score7.8 (High)
EPSS exploit chance2.6% (top 15%)
CISA exploited listNo
WeaknessCWE-119
Published2009-09-08
Last modified2026-06-16
Publisher (CNA): MITRE · Vendor: asterisk · sangoma

Share: LinkedIn · X · Reddit

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

asterisk asterisk DOWNGRADE
Affected: b.1.3.2 · b.1.3.3 · b.2.2.0 · b.2.2.1 · b.2.3.1 · b.2.3.2 · b.2.3.3 · b.2.3.4
Fixed in: no fixed release known
Safe to downgrade to: a release before b.1.3.2
1. Check installed version
apt-cache policy asterisk || rpm -q asterisk || asterisk --version
2. No fixed release: DOWNGRADE to a release before b.1.3.2 (Debian / Ubuntu)
apt-cache madison asterisk sudo apt install asterisk=<VERSION_BEFORE_b.1.3.2> sudo apt-mark hold asterisk
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list asterisk sudo dnf downgrade asterisk-<VERSION_BEFORE_b.1.3.2> 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.
asterisk open source DOWNGRADE
Affected: 1.2.0 · 1.2.0 beta1 · 1.2.0 beta2 · 1.2.0 rc1 · 1.2.0 rc2 · 1.2.1 · 1.2.2 · 1.2.2 netsec
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.2.0
1. Check installed version
apt-cache policy open-source || rpm -q open-source || open-source --version
2. No fixed release: DOWNGRADE to a release before 1.2.0 (Debian / Ubuntu)
apt-cache madison open-source sudo apt install open-source=<VERSION_BEFORE_1.2.0> sudo apt-mark hold open-source
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list open-source sudo dnf downgrade open-source-<VERSION_BEFORE_1.2.0> sudo dnf versionlock add open-source
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.
asterisk opensource DOWNGRADE
Affected: 1.4.23.2 · 1.4.24 · 1.4.24.1 · 1.4.26 · 1.4.26.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.4.23.2
1. Check installed version
apt-cache policy opensource || rpm -q opensource || opensource --version
2. No fixed release: DOWNGRADE to a release before 1.4.23.2 (Debian / Ubuntu)
apt-cache madison opensource sudo apt install opensource=<VERSION_BEFORE_1.4.23.2> sudo apt-mark hold opensource
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list opensource sudo dnf downgrade opensource-<VERSION_BEFORE_1.4.23.2> sudo dnf versionlock add opensource
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 asterisk DOWNGRADE
Affected: 1.6.1 · 1.6.1.4
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.6.1
1. Check installed version
apt-cache policy asterisk || rpm -q asterisk || asterisk --version
2. No fixed release: DOWNGRADE to a release before 1.6.1 (Debian / Ubuntu)
apt-cache madison asterisk sudo apt install asterisk=<VERSION_BEFORE_1.6.1> sudo apt-mark hold asterisk
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list asterisk sudo dnf downgrade asterisk-<VERSION_BEFORE_1.6.1> 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.
asterisk appliance s800i MITIGATE
Affected: 1.3 · 1.3.0.2
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.3
Firmware
Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.
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-2009-2346?

asterisk: downgrade or apply the listed mitigation; open source: downgrade or apply the listed mitigation; opensource: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2009-2346 being exploited?

CVE-2009-2346 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-2009-2346 affect?

CVE-2009-2346 affects asterisk, open source, opensource. Severity is high (CVSS 7.8). The IAX2 protocol implementation in Asterisk Open Source 1.2.x before 1.2.35, 1.4.x before 1.4.26.2, 1.6.0.x before 1.6.0.15, and 1.6.1.x before 1.6.1.6; Business Edition B.x.x before B.2.5.10, C.2.x before C.2.4.3, and C.3.x before C.3.1.1

How urgent is CVE-2009-2346?

Priority 49/100. High severity

Related CVEs

References

← Back to latest CVEs

Get the weekly exploited-CVE digest by emailThe CVEs being attacked this week and how to fix them. No spam, unsubscribe any time.