Remote code execution via unchecked SMS address length
Published Apr 17, 2024 · Updated Nov 4, 2025
Stack-based buffer overflow in oFono before 2.1 allows remote attackers to execute code through a crafted SMS PDU. sms_decode_address_field() derives byte_len from the untrusted address length and passes it to extract_bcd_number(), which writes two output bytes per input byte into a fixed stack buffer without checking its capacity. A malicious base station, compromised modem, or delivered SMS can reach the parser without authentication, and successful exploitation runs code as the service account.
Summary
What happened
Stack-based buffer overflow in oFono before 2.1 allows remote attackers to execute code through a crafted SMS PDU. sms_decode_address_field() derives byte_len from the untrusted address length and passes it to extract_bcd_number(), which writes two output bytes per input byte into a fixed stack buffer without checking its capacity. A malicious base station, compromised modem, or delivered SMS can reach the parser without authentication, and successful exploitation runs code as the service account.
The record
- CVE
- CVE-2023-4233
- Published
- Apr 17, 2024
- Updated
- Nov 4, 2025
- Vendor
- Fedora Project
- Product
- Fedora Linux
- Classifications
- CWE-119, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 17, 2024CVE publishedPublication date reported by the CVE source.
- Nov 4, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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