CVE-2021-45255: The email parameter from ajax.php of Video Sharing Website 1.0 appears to be vulnerable to SQL injection attac

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-45255 is a critical-severity flaw (CVSS 9.8) affecting video sharing website. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The email parameter from ajax.php of Video Sharing Website 1.0 appears to be vulnerable to SQL injection attacks. A payload injects a SQL sub-query that calls MySQL's load_file function with a UNC file path that references a URL on an external domain. The application interacted with that domain, indicating that the injected SQL query was executed.

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	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-89
Published	2021-12-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: video sharing website project

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

Am I affected?

Timeline

2021-12-21 12:15 UTCPublished CVE record published
2026-06-17 04:13 UTCUpdated Record last modified

video sharing website project video sharing website 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 video-sharing-website || rpm -q video-sharing-website || video-sharing-website --version

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

apt-cache madison video-sharing-website sudo apt install video-sharing-website=<VERSION_BEFORE_1.0> sudo apt-mark hold video-sharing-website

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

dnf --showduplicates list video-sharing-website sudo dnf downgrade video-sharing-website-<VERSION_BEFORE_1.0> sudo dnf versionlock add video-sharing-website

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-2021-45255?

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

Is CVE-2021-45255 being exploited?

CVE-2021-45255 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-2021-45255 affect?

CVE-2021-45255 affects video sharing website. Severity is critical (CVSS 9.8). The email parameter from ajax.php of Video Sharing Website 1.0 appears to be vulnerable to SQL injection attacks. A payload injects a SQL sub-query that calls MySQL's load_file function with a UNC file path that references a URL on an exter

How urgent is CVE-2021-45255?

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

Software pages

PHP vulnerabilities · MySQL vulnerabilities

References

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