CVE-2025-13470High· 7.5▾ TwilightIn RNP version 0.18.0 a refactoring regression causes the symmetric session key used for Public-Key Encrypted Session Key (PKESK) packets to be left uninitialized except for zeroing, resulting in it always being an all-zero byte array…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.3%
In RNP version 0.18.0 a refactoring regression causes the symmetric session key used for Public-Key Encrypted Session Key (PKESK) packets to be left uninitialized except for zeroing, resulting in it always being an all-zero byte array.
Any data encrypted using public-key encryption in this release can be decrypted trivially by supplying an all-zero session key, fully compromising confidentiality.
The vulnerability affects only public key encryption (PKESK packets). Passphrase-based encryption (SKESK packets) is not affected.
Root cause: Vulnerable session key buffer used in PKESK packet generation.
The defect was introduced in commit 7bd9a8dc356aae756b40755be76d36205b6b161a where initialization
logic inside encrypted_build_skesk() only randomized the key for the
SKESK path and omitted it for the PKESK path.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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