CVE-2021-43674: ThinkUp 2.0-beta.10 is affected by a path manipulation vulnerability in Smarty.class.php

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-43674 is a critical-severity flaw (CVSS 9.8) affecting thinkup. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ThinkUp 2.0-beta.10 is affected by a path manipulation vulnerability in Smarty.class.php. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

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	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-22
Published	2021-12-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: thinkupapp

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

Am I affected?

Timeline

2021-12-03 13:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

thinkupapp thinkup DOWNGRADE

Affected: 2.0 beta10

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy thinkup || rpm -q thinkup || thinkup --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison thinkup sudo apt install thinkup=<VERSION_BEFORE_2.0> sudo apt-mark hold thinkup

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

dnf --showduplicates list thinkup sudo dnf downgrade thinkup-<VERSION_BEFORE_2.0> sudo dnf versionlock add thinkup

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-2021-43674?

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

Is CVE-2021-43674 being exploited?

CVE-2021-43674 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-2021-43674 affect?

CVE-2021-43674 affects thinkup. Severity is critical (CVSS 9.8). ThinkUp 2.0-beta.10 is affected by a path manipulation vulnerability in Smarty.class.php. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

How urgent is CVE-2021-43674?

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

Software pages

PHP vulnerabilities

References

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