CVE-2021-47900
Unauthenticated RCE in Gila CMS via manipulated User-Agent header.
Is CVE-2021-47900 being exploited?
Not confirmed. CVE-2021-47900 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 0.64% probability of exploitation in the next 30 days.
How severe is CVE-2021-47900?
CVE-2021-47900 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-2021-47900?
Yes. A fix has been recorded for CVE-2021-47900. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2021-47900 affect?
CVE-2021-47900 affects Gila CMS < 2.0.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2021-47900?
Upgrade to 2.0.0+; if not possible, deploy WAF rules to block crafted headers.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via crafted User-Agent header; unauthenticated; attacker can run arbitrary OS commands and take over the server.
Immediate action required
- affected< 2.0.0
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.