Widespread Apache Spark History Server vulnerability enabling remote code execution; widely used tech.
CVE-2025-54920
RCE in Spark History Server via crafted event logs (Jackson deserialization) pre-3.5.7/4.0.1.
Is CVE-2025-54920 being exploited?
Not confirmed. CVE-2025-54920 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 5.3% probability of exploitation in the next 30 days.
How severe is CVE-2025-54920?
CVE-2025-54920 is rated High with a CVSS score of 8.8. 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-2025-54920?
Yes. A fix has been recorded for CVE-2025-54920. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-54920 affect?
CVE-2025-54920 affects Apache Spark History Server (3.5.4 and earlier). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-54920?
Upgrade to Spark 3.5.7 or 4.0.1+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on the Spark History Server by injecting JSON into event logs; attacker could run arbitrary commands.
Immediate action required
- affected< 3.5.7
- affected>= 4.0.0 and < 4.0.1
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.