CVE-2021-35456: Online Pet Shop We App 1.0 is vulnerable to remote SQL injection and shell upload

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-35456 is a critical-severity flaw (CVSS 9.8) affecting online pet shop web application. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Online Pet Shop We App 1.0 is vulnerable to remote SQL injection and shell upload

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	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-89
Published	2021-06-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: online pet shop web application project

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

Am I affected?

Timeline

2021-06-28 15:15 UTCPublished CVE record published
2026-06-17 03:57 UTCUpdated Record last modified

online pet shop web application project online pet shop web application 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 online-pet-shop-web-application || rpm -q online-pet-shop-web-application || online-pet-shop-web-application --version

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

apt-cache madison online-pet-shop-web-application sudo apt install online-pet-shop-web-application=<VERSION_BEFORE_1.0> sudo apt-mark hold online-pet-shop-web-application

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

dnf --showduplicates list online-pet-shop-web-application sudo dnf downgrade online-pet-shop-web-application-<VERSION_BEFORE_1.0> sudo dnf versionlock add online-pet-shop-web-application

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-2021-35456?

online pet shop web application: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-35456 being exploited?

CVE-2021-35456 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-2021-35456 affect?

CVE-2021-35456 affects online pet shop web application. Severity is critical (CVSS 9.8). Online Pet Shop We App 1.0 is vulnerable to remote SQL injection and shell upload

How urgent is CVE-2021-35456?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-40935 HIGH 7.2 DOWNGRADE Online Pet Shop We App v1.0 is vulnerable to SQL Injection via /pet_shop/classes/Master.php?f=delete_category,
CVE-2022-40934 HIGH 7.2 DOWNGRADE Online Pet Shop We App v1.0 is vulnerable to SQL injection via /pet_shop/classes/Master.php?f=delete_sub_categ
CVE-2022-40933 HIGH 7.2 DOWNGRADE Online Pet Shop We App v1.0 by oretnom23 is vulnerable to SQL injection via /pet_shop/classes/Master.php?f=del

References

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