Service interruption via oversized TPM RSA key export
Published Aug 4, 2025 · Updated Aug 5, 2025
Stack-based buffer overflow in wolfSSL wolfTPM through 3.9.2 allows physically proximate attackers to interrupt service during RSA key export. wolfTPM2_RsaKey_TpmToWolf copies an external TPM RSA key into a stack buffer sized by MAX_RSA_KEY_BITS without validating that the key fits. Reachability requires a TPM 2.0 module supporting keys larger than 2048 bits, the default 2048-bit macro, and an application that creates or imports such a key and calls the wrapper.
Summary
What happened
Stack-based buffer overflow in wolfSSL wolfTPM through 3.9.2 allows physically proximate attackers to interrupt service during RSA key export. wolfTPM2_RsaKey_TpmToWolf copies an external TPM RSA key into a stack buffer sized by MAX_RSA_KEY_BITS without validating that the key fits. Reachability requires a TPM 2.0 module supporting keys larger than 2048 bits, the default 2048-bit macro, and an application that creates or imports such a key and calls the wrapper.
The record
- CVE
- CVE-2025-7844
- Published
- Aug 4, 2025
- Updated
- Aug 5, 2025
- Vendor
- wolfSSL
- Product
- wolfTPM
- Classifications
- CWE-121
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 4, 2025CVE publishedPublication date reported by the CVE source.
- Aug 5, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=3.9.2
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo