{"id":"CVE-2025-12888","summary":"Constant Time Issue with Xtensa-based ESP32 and X22519","details":"Vulnerability in X25519 constant-time cryptographic implementations due to timing side channels introduced by compiler optimizations and CPU architecture limitations, specifically with the Xtensa-based ESP32 chips. If targeting Xtensa it is recommended to use the low memory implementations of X25519, which is now turned on as the default for Xtensa.","modified":"2026-08-12T03:51:37.964351859Z","published":"2025-11-21T22:50:30.510Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/12xxx/CVE-2025-12888.json","unresolved_ranges":[{"extracted_events":[{"fixed":"5.8.4"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"wolfSSL","cwe_ids":["CWE-203"]},"references":[{"type":"WEB","url":"https://https://github.com/wolfSSL/wolfssl/pull/9275"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/12xxx/CVE-2025-12888.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-12888"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/wolfssl/wolfssl","events":[{"introduced":"decea12e223869c8f8f3ab5a53dc90b69f436eb2"},{"last_affected":"decea12e223869c8f8f3ab5a53dc90b69f436eb2"}],"database_specific":{"cpe":"cpe:2.3:a:wolfssl:wolfssl:5.8.2:*:*:*:*:*:*:*","extracted_events":[{"introduced":"5.8.2"},{"last_affected":"5.8.2"}],"source":"CPE_STRING"}}],"versions":["5.8.2","v5.8.2-stable"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-12888.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:P/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:L/SA:N"}]}