CVE-2021-47753
Unauthenticated file upload in phpKF CMS 3.00 Beta y6 enables RCE via fake PNG.
Is CVE-2021-47753 being exploited?
Not confirmed. CVE-2021-47753 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.76% probability of exploitation in the next 30 days.
How severe is CVE-2021-47753?
CVE-2021-47753 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2021-47753?
Not known from our data. No patch reference has been recorded for CVE-2021-47753, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2021-47753 affect?
CVE-2021-47753 affects phpKF CMS 3.00 Beta y6. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2021-47753?
Patch/upgrade when available; disable unauthenticated uploads.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
RCE via unauthenticated upload; PHP file disguised as PNG executes commands on the web server.
Patch when possible
- affected3.00
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.