CVE-2021-29400: A cross-site request forgery (CSRF) vulnerability in the My SMTP Contact v1.1.1 plugin for GetSimple CMS allow

Routine

MEDIUM 6.5DOWNGRADE

CVE-2021-29400 is a medium-severity flaw (CVSS 6.5) affecting my smtp contact. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross-site request forgery (CSRF) vulnerability in the My SMTP Contact v1.1.1 plugin for GetSimple CMS allows remote attackers to change the SMTP settings of the contact forms for the webpages of the CMS after an authenticated admin visits a malicious third-party site.

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	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-352
Published	2021-08-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: netexplorer

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

Am I affected?

Timeline

2021-08-10 23:15 UTCPublished CVE record published
2026-06-17 03:47 UTCUpdated Record last modified

netexplorer my smtp contact DOWNGRADE

Affected: 1.1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.1

1. Check installed version

apt-cache policy my-smtp-contact || rpm -q my-smtp-contact || my-smtp-contact --version

2. No fixed release: DOWNGRADE to a release before 1.1.1 (Debian / Ubuntu)

apt-cache madison my-smtp-contact sudo apt install my-smtp-contact=<VERSION_BEFORE_1.1.1> sudo apt-mark hold my-smtp-contact

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

dnf --showduplicates list my-smtp-contact sudo dnf downgrade my-smtp-contact-<VERSION_BEFORE_1.1.1> sudo dnf versionlock add my-smtp-contact

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-2021-29400?

my smtp contact: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-29400 being exploited?

CVE-2021-29400 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-2021-29400 affect?

CVE-2021-29400 affects my smtp contact. Severity is medium (CVSS 6.5). A cross-site request forgery (CSRF) vulnerability in the My SMTP Contact v1.1.1 plugin for GetSimple CMS allows remote attackers to change the SMTP settings of the contact forms for the webpages of the CMS after an authenticated admin visit

How urgent is CVE-2021-29400?

Priority 39/100. Public exploit reference

References

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