Vulnerability Details : CVE-2021-40530
The ElGamal implementation in Crypto++ through 8.5 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.
Products affected by CVE-2021-40530
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- cpe:2.3:a:cryptopp:crypto\+\+:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-40530
0.22%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 59 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-40530
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.6
|
LOW | AV:N/AC:H/Au:N/C:P/I:N/A:N |
4.9
|
2.9
|
NIST | |
|
5.9
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
2.2
|
3.6
|
NIST |
CWE ids for CVE-2021-40530
-
The product uses a broken or risky cryptographic algorithm or protocol.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-40530
-
https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2
On the (in)security of ElGamal in OpenPGP - Part II - Syssec@IBM ResearchExploit;Third Party Advisory
-
https://eprint.iacr.org/2021/923
Cryptology ePrint Archive: Report 2021/923 - On the (in)security of ElGamal in OpenPGPTechnical Description;Third Party Advisory
-
https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1
On the (in)security of ElGamal in OpenPGP - Part I - Syssec@IBM ResearchThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HGVBZ2TTRKCTYAZTRHTF6OBD4W37F5MT/
[SECURITY] Fedora 35 Update: cryptopp-8.6.0-1.fc35 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/57OJA2K5AHX5HAU2QBDRWLGIIUX7GASC/
[SECURITY] Fedora 33 Update: cryptopp-8.6.0-1.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VJYOZGWI7TD27SEXILSM6VUTPPEICDL7/
[SECURITY] Fedora 34 Update: cryptopp-8.6.0-1.fc34 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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