CVE-2018-11551: AXON PBX 2.02 contains a DLL hijacking vulnerability that could allow an unauthenticated, remote attacker to e

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HIGH 7.8DOWNGRADE

CVE-2018-11551 is a high-severity flaw (CVSS 7.8) affecting axon pbx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

AXON PBX 2.02 contains a DLL hijacking vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system. The vulnerability exists because a DLL file is loaded by 'pbxsetup.exe' improperly.

Why this priority

High severity

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.5% (top 16%)
CISA exploited list	No
Weakness	CWE-426
Published	2018-06-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nch

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

Am I affected?

Timeline

2018-06-01 17:29 UTCPublished CVE record published
2026-06-17 01:36 UTCUpdated Record last modified

nch axon pbx DOWNGRADE

Affected: 2.02

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.02

1. Check installed version

apt-cache policy axon-pbx || rpm -q axon-pbx || axon-pbx --version

2. No fixed release: DOWNGRADE to a release before 2.02 (Debian / Ubuntu)

apt-cache madison axon-pbx sudo apt install axon-pbx=<VERSION_BEFORE_2.02> sudo apt-mark hold axon-pbx

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list axon-pbx sudo dnf downgrade axon-pbx-<VERSION_BEFORE_2.02> sudo dnf versionlock add axon-pbx

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.

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-2018-11551?

axon pbx: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-11551 being exploited?

CVE-2018-11551 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-2018-11551 affect?

CVE-2018-11551 affects axon pbx. Severity is high (CVSS 7.8). AXON PBX 2.02 contains a DLL hijacking vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system. The vulnerability exists because a DLL file is loaded by 'pbxsetup.exe' improperly.

How urgent is CVE-2018-11551?

Priority 48/100. High severity

Related CVEs

CVE-2021-37462 MEDIUM 5.4 UPGRADE Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via /ipblacklist?errorip= (reflected).
CVE-2021-37461 MEDIUM 5.4 UPGRADE Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via /extensionsinstruction?id= (reflected)
CVE-2021-37460 MEDIUM 5.4 UPGRADE Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via /planprop?id= (reflected).
CVE-2021-37459 MEDIUM 5.4 UPGRADE Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via the customer name field (stored).
CVE-2021-37458 MEDIUM 5.4 UPGRADE Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via the primary phone field (stored).

References

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