CVE-2021-43398
Crypto++ (aka Cryptopp) 8.6.0 and earlier contains a timing leakage in MakePublicKey().
Does this matter?
Lower severity and a low EPSS score (1.96%). Track it; it rarely justifies an emergency change on its own.
Description
Crypto++ (aka Cryptopp) 8.6.0 and earlier contains a timing leakage in MakePublicKey(). There is a clear correlation between execution time and private key length, which may cause disclosure of the length information of the private key. This might allow attackers to conduct timing attacks. NOTE: this report is disputed by the vendor and multiple third parties. The execution-time differences are intentional. A user may make a choice of a longer key as a tradeoff between strength and performance. In making this choice, the amount of information leaked to an adversary is of infinitesimal value
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 1.96% probability · 79th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-203
- Affected
- cryptopp/crypto\+\+
- Source
- cve@mitre.org
References
- https://cryptopp.comVendor Advisory
- https://github.com/weidai11/cryptopp/issues/1080Exploit, Third Party Advisory
- https://github.com/weidai11/cryptopp/issues/1080#issuecomment-996492222Exploit, Issue Tracking, Third Party Advisory
- https://cryptopp.comVendor Advisory
- https://github.com/weidai11/cryptopp/issues/1080Exploit, Third Party Advisory
- https://github.com/weidai11/cryptopp/issues/1080#issuecomment-996492222Exploit, Issue Tracking, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.