CVE-2021-45966: An issue was discovered in Pascom Cloud Phone System before 7.20.x

Q: How do I fix CVE-2021-45966?

cloud phone system: upgrade to newer than 7.19. Exact commands for each OS are on this page.

Q: Is CVE-2021-45966 being exploited?

CVE-2021-45966 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-2021-45966 affect?

CVE-2021-45966 affects cloud phone system. Severity is critical (CVSS 9.8). An issue was discovered in Pascom Cloud Phone System before 7.20.x. In the management REST API, /services/apply in exd.pl allows remote attackers to execute arbitrary code via shell metacharacters.

Q: How urgent is CVE-2021-45966?

Priority 68/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-45966 is a critical-severity flaw (CVSS 9.8) affecting cloud phone system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Pascom Cloud Phone System before 7.20.x. In the management REST API, /services/apply in exd.pl allows remote attackers to execute arbitrary code via shell metacharacters.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	6.0% (top 7%)
CISA exploited list	No
Weakness	CWE-78
Published	2022-03-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: pascom

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

Am I affected?

Timeline

2022-03-18 05:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

pascom cloud phone system UPGRADE

Affected: <= 7.19

Fixed in: newer than 7.19

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cloud-phone-system || rpm -q cloud-phone-system || cloud-phone-system --version

2. UPGRADE to newer than 7.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cloud-phone-system

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cloud-phone-system

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-2021-45966?

cloud phone system: upgrade to newer than 7.19. Exact commands for each OS are on this page.

Is CVE-2021-45966 being exploited?

CVE-2021-45966 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-2021-45966 affect?

CVE-2021-45966 affects cloud phone system. Severity is critical (CVSS 9.8). An issue was discovered in Pascom Cloud Phone System before 7.20.x. In the management REST API, /services/apply in exd.pl allows remote attackers to execute arbitrary code via shell metacharacters.

How urgent is CVE-2021-45966?

Priority 68/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-45968 HIGH 7.5 MITIGATE UPGRADE An issue was discovered in xmppserver jar in the XMPP Server component of the JIve platform, as used in Pascom
CVE-2021-45967 CRITICAL 9.8 UPGRADE UPGRADE An issue was discovered in Pascom Cloud Phone System before 7.20.x

References

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