CVE-2025-66802: Sourcecodester Covid-19 Contact Tracing System 1.0 is vulnerable to RCE (Remote Code Execution)

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2025-66802 is a critical-severity flaw (CVSS 9.8) affecting covid-19 contact tracing system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sourcecodester Covid-19 Contact Tracing System 1.0 is vulnerable to RCE (Remote Code Execution). The application receives a reverse shell (php) into imagem of the user enabling RCE.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-434
Published	2026-01-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: covid-19 contact tracing system project

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

Am I affected?

Timeline

2026-01-12 20:15 UTCPublished CVE record published
2026-06-17 09:57 UTCUpdated Record last modified

covid-19 contact tracing system project covid-19 contact tracing system 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 covid-19-contact-tracing-system || rpm -q covid-19-contact-tracing-system || covid-19-contact-tracing-system --version

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

apt-cache madison covid-19-contact-tracing-system sudo apt install covid-19-contact-tracing-system=<VERSION_BEFORE_1.0> sudo apt-mark hold covid-19-contact-tracing-system

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

dnf --showduplicates list covid-19-contact-tracing-system sudo dnf downgrade covid-19-contact-tracing-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add covid-19-contact-tracing-system

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · jgmenu · FIXED · 4.7.0-1.fc46 · FEDORA-2026-3053ee4399 · source

sudo dnf upgrade --advisory=FEDORA-2026-3053ee4399

Fedora ELN · python-tkrzw · FIXED · 0.1.32-12.eln159 · FEDORA-2026-0161d71544 · source

sudo dnf upgrade --advisory=FEDORA-2026-0161d71544

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: mtgsjr/CVE-2025-66802 (2 stars)

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-2025-66802?

covid-19 contact tracing system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-66802 being exploited?

CVE-2025-66802 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-2025-66802 affect?

CVE-2025-66802 affects covid-19 contact tracing system. Severity is critical (CVSS 9.8). Sourcecodester Covid-19 Contact Tracing System 1.0 is vulnerable to RCE (Remote Code Execution). The application receives a reverse shell (php) into imagem of the user enabling RCE.

How urgent is CVE-2025-66802?

Priority 62/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

References

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