CVE-2020-12842: ismartgate PRO 1.5.9 is vulnerable to privilege escalation by appending PHP code to /cron/checkUserExpirationD

This week

CRITICAL 9.8REMOTEMITIGATE

CVE-2020-12842 is a critical-severity flaw (CVSS 9.8) affecting ismartgate pro firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ismartgate PRO 1.5.9 is vulnerable to privilege escalation by appending PHP code to /cron/checkUserExpirationDate.php.

Why this priority

Critical severity
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	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-732
Published	2020-09-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: gogogate

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

Am I affected?

Timeline

2020-09-24 16:15 UTCPublished CVE record published
2026-06-17 02:52 UTCUpdated Record last modified

gogogate ismartgate pro firmware MITIGATE

Affected: 1.5.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5.9

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-2020-12842?

ismartgate pro firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-12842 being exploited?

CVE-2020-12842 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-2020-12842 affect?

CVE-2020-12842 affects ismartgate pro firmware. Severity is critical (CVSS 9.8). ismartgate PRO 1.5.9 is vulnerable to privilege escalation by appending PHP code to /cron/checkUserExpirationDate.php.

How urgent is CVE-2020-12842?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-13119 HIGH 8.1 MITIGATE ismartgate PRO 1.5.9 is vulnerable to clickjacking.
CVE-2020-12843 CRITICAL 9.8 MITIGATE ismartgate PRO 1.5.9 is vulnerable to malicious file uploads via the form for uploading sounds to garage doors
CVE-2020-12841 MEDIUM 6.5 MITIGATE ismartgate PRO 1.5.9 is vulnerable to CSRF that allows remote attackers to upload imae files via /index.php
CVE-2020-12840 MEDIUM 6.5 MITIGATE ismartgate PRO 1.5.9 is vulnerable to CSRF that allows remote attackers to upload sound files via /index.php
CVE-2020-12839 CRITICAL 9.8 MITIGATE ismartgate PRO 1.5.9 is vulnerable to privilege escalation by appending PHP code to /cron/checkExpirationDate.

References

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