Out-of-bounds Read in Splunk
CVE-2021-3422
The lack of validation of a key-value field in the Splunk-to-Splunk protocol results in a denial-of-service in Splunk Enterprise instances configured to index Universal Forwarder traffic. The vulnerability impacts Splunk Enterprise versions before 7.3.9, 8.0 versions before 8.0.9, and 8.1 versions before 8.1.3. It does not impact Universal Forwarders. When Splunk forwarding is secured using TLS or a Token, the attack requires compromising the certificate or token, or both. Implementation of either or both reduces the severity to Medium.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Splunk
- Splunk Enterprise — versions 8.2 version(s) before 8.2.0, 8.1 version(s) before 8.1.3, 8.0 version(s) before 8.0.9
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.splunk.com/en_us/product-security/announcements/svd-2022-0301.html (Vendor Advisory)
- claroty.com/2022/03/24/blog-research-locking-down-splunk-enterprise-indexers-an… (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3422?
- CVE-2021-3422 is a high-severity vulnerability in Splunk, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2022-03-25.
- How severe is CVE-2021-3422?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-3422 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.