CVE-2021-43439: RCE in Add Review Function in iResturant 1.0 Allows remote attacker to execute commands remotely

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-43439 is a critical-severity flaw (CVSS 9.8) affecting iresturant. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

RCE in Add Review Function in iResturant 1.0 Allows remote attacker to execute commands remotely

Why this priority

Critical severity
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	3.6% (top 11%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-12-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: iresturant project

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

Am I affected?

Timeline

2021-12-20 20:15 UTCPublished CVE record published
2026-06-17 04:10 UTCUpdated Record last modified

iresturant project iresturant DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison iresturant sudo apt install iresturant=<VERSION_BEFORE_1.0> sudo apt-mark hold iresturant

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

dnf --showduplicates list iresturant sudo dnf downgrade iresturant-<VERSION_BEFORE_1.0> sudo dnf versionlock add iresturant

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-2021-43439?

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

Is CVE-2021-43439 being exploited?

CVE-2021-43439 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-2021-43439 affect?

CVE-2021-43439 affects iresturant. Severity is critical (CVSS 9.8). RCE in Add Review Function in iResturant 1.0 Allows remote attacker to execute commands remotely

How urgent is CVE-2021-43439?

Priority 62/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-45803 HIGH 8.8 DOWNGRADE MartDevelopers iResturant 1.0 is vulnerable to SQL Injection
CVE-2021-45802 CRITICAL 9.8 DOWNGRADE MartDevelopers iResturant 1.0 is vulnerable to SQL Injection
CVE-2021-43438 MEDIUM 5.4 DOWNGRADE Stored XSS in Signup Form in iResturant 1.0 Allows Remote Attacker to Inject Arbitrary code via NAME and ADDRE
CVE-2021-43436 MEDIUM 5.4 DOWNGRADE MartDevelopers Inc iResturant v1.0 allows Stored XSS by placing a payload in the username field during a login

References

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