CVE-2020-12840: ismartgate PRO 1.5.9 is vulnerable to CSRF that allows remote attackers to upload sound files via /index.php

Routine

MEDIUM 6.5MITIGATE

CVE-2020-12840 is a medium-severity flaw (CVSS 6.5) 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 CSRF that allows remote attackers to upload sound files via /index.php

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-352
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-2020-12840?

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

Is CVE-2020-12840 being exploited?

CVE-2020-12840 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-2020-12840 affect?

CVE-2020-12840 affects ismartgate pro firmware. Severity is medium (CVSS 6.5). ismartgate PRO 1.5.9 is vulnerable to CSRF that allows remote attackers to upload sound files via /index.php

How urgent is CVE-2020-12840?

Priority 38/100. Public exploit reference

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-2020-12842 CRITICAL 9.8 MITIGATE ismartgate PRO 1.5.9 is vulnerable to privilege escalation by appending PHP code to /cron/checkUserExpirationD
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-2020-12839 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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