CVE-2020-22724: A remote command execution vulnerability exists in add_server_service of PPTP_SERVER in Mercury Router MER1200

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CRITICAL 9.8REMOTEMITIGATEMITIGATE

CVE-2020-22724 is a critical-severity flaw (CVSS 9.8) affecting mer1200 firmware, mer1200g firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A remote command execution vulnerability exists in add_server_service of PPTP_SERVER in Mercury Router MER1200 v1.0.1 and Mercury Router MER1200G v1.0.1.

Why this priority

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

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.6% (top 7%)
CISA exploited list	No
Weakness	CWE-78
Published	2021-10-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mercury

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

Am I affected?

Timeline

2021-10-14 11:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

mercury mer1200 firmware MITIGATE

Affected: 1.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

mercury mer1200g firmware MITIGATE

Affected: 1.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2020-22724?

mer1200 firmware: mitigate or apply the listed mitigation; mer1200g firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-22724 being exploited?

CVE-2020-22724 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-2020-22724 affect?

CVE-2020-22724 affects mer1200 firmware, mer1200g firmware. Severity is critical (CVSS 9.8). A remote command execution vulnerability exists in add_server_service of PPTP_SERVER in Mercury Router MER1200 v1.0.1 and Mercury Router MER1200G v1.0.1.

How urgent is CVE-2020-22724?

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

References

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