Vulnerability · CVE-2025-55039
This issue affects Apache Spark versions before 3.4.4, 3.5.2 and 4.0.0.
Published Oct 15, 2025 · catalog updated Nov 4, 2025 · Apache Software Foundation Apache Spark
Last checked Oct 31, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2025-55039. EPSS is 0.21%. Act only if a listed version of Apache Software Foundation Apache Spark is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium6.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.21%
- Remediation
- Version ranges on file
- Affected products
- vendor Apache Software Foundation Apache Spark 0 <3.4.4
This issue affects Apache Spark versions before 3.4.4, 3.5.2 and 4.0.0. Apache Spark versions before 4.0.0, 3.5.2 and 3.4.4 use an insecure default network encryption cipher for RPC communication between nodes. When spark.network.crypto.enabled is set to true (it is set to false by default), but spark.network.crypto.cipher is not explicitly configured, Spark defaults to AES in CTR mode (AES/CTR/NoPadding), which provides encryption without authentication. This vulnerability allows a man-in-the-middle attacker to modify encrypted RPC traffic undetected by flipping bits in ciphertext, potentiall
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor Apache Software Foundation Apache Spark 0 <3.4.40 <3.4.4
How to fix CVE-2025-55039
Upgrade
CVE-2025-55039 lists a fix boundary at 3.4.4. Compare the installed build with that boundary before you change production.
Version check
Seen in 0 <3.4.4
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2025-55039. EPSS is 0.21%. Act only if a listed version of Apache Software Foundation Apache Spark is installed.
Which versions are affected?
Compare what you have installed with Apache Software Foundation Apache Spark 0 <3.4.4 0 <3.4.4. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 15, 2025 · EUVD
Detected
This issue affects Apache Spark versions before 3.4.4, 3.5.2 and 4.0.0. Apache Spark versions before 4.0.0, 3.5.2 and 3.4.4 use an insecure default network encryption cipher for RPC communication between nodes. When spark.network.crypto.enabled is set to true (it is set to false by default), but spark.network.crypto.cipher is not explicitly configured, Spark defaults to AES in CTR mode (AES/CTR/No
Nov 4, 2025 · EUVD
Updated
This issue affects Apache Spark versions before 3.4.4, 3.5.2 and 4.0.0. Apache Spark versions before 4.0.0, 3.5.2 and 3.4.4 use an insecure default network encryption cipher for RPC communication between nodes. When spark.network.crypto.enabled is set to true (it is set to false by default), but spark.network.crypto.cipher is not explicitly configured, Spark defaults to AES in CTR mode (AES/CTR/No
Sources
- CVE.orgVulnerability recordCVE-2025-55039
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2025-55039
30-day exploitation probability 0.21%
first.org - EUVDVulnerability recordEUVD-2025-34531
This issue affects Apache Spark versions before 3.4.4, 3.5.2 and 4.0.0. Apache Spark versions before 4.0.0, 3.5.2 and 3.4.4 use an insecure default network encryption cipher for RPC communication between nodes. When spark.network.crypto.enabled is set to true (it is set to false
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Oct 31, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSOct 31, 2026
- CVE.orgOct 25, 2026
- EUVDOct 25, 2026