CVE-2023-21517
Published: 28 June 2023
Summary
CVE-2023-21517 is a high-severity Classic Buffer Overflow (CWE-120) vulnerability in Samsung Exynos. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 7.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2023-21517 is a heap out-of-bounds write vulnerability, also referenced under CWE-120 and CWE-787, that affects the Exynos baseband in Samsung devices prior to the SMR Jun-2023 Release 1. The flaw carries a CVSS 3.1 score of 8.8 and permits memory corruption that can lead to arbitrary code execution.
A remote attacker can exploit the issue over an adjacent network with low attack complexity, without requiring privileges or user interaction. Successful exploitation grants the ability to execute arbitrary code with high impact on confidentiality, integrity, and availability of the affected baseband component.
Samsung's June 2023 security bulletin, referenced at security.samsungmobile.com, addresses the vulnerability through the SMR Jun-2023 Release 1 update that patches the Exynos baseband prior to that version. The EPSS score remains flat at 0.0852 with no indicated rise after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-25685
Vulnerability details
Heap out-of-bound write vulnerability in Exynos baseband prior to SMR Jun-2023 Release 1 allows remote attacker to execute arbitrary code.
- 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.
Platform-independent managed code eliminates the need for unchecked native buffer copies that are the root cause of classic buffer overflows.
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.