CVE-2021-3520
Published: 02 June 2021
Summary
CVE-2021-3520 is a critical-severity Integer Overflow or Wraparound (CWE-190) vulnerability in Splunk Universal Forwarder. Its CVSS base score is 9.8 (Critical).
Operationally, ranked at the 33.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-26836
Vulnerability details
There's a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4 may be able to trigger an integer overflow, leading to calling of memmove() on a negative size argument, causing an out-of-bounds write…
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and/or a crash. The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.