CVE-2016-9939
Crypto++ (aka cryptopp and libcrypto++) 5.6.4 contained a bug in its ASN.1 BER decoding routine.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.20%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Crypto++ (aka cryptopp and libcrypto++) 5.6.4 contained a bug in its ASN.1 BER decoding routine. The library will allocate a memory block based on the length field of the ASN.1 object. If there is not enough content octets in the ASN.1 object, then the function will fail and the memory block will be zeroed even if its unused. There is a noticeable delay during the wipe for a large allocation.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 4.20% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- cryptopp/crypto\+\+ · debian/debian linux
- Source
- cve@mitre.org
EPSS 4.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.debian.org/security/2016/dsa-3748Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/12/12/7Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/94854Third Party Advisory, VDB Entry
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7IL5A6465IEPW5GAWGXB2ENJPFYVWTJM/
- http://www.debian.org/security/2016/dsa-3748Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/12/12/7Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/94854Third Party Advisory, VDB Entry
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7IL5A6465IEPW5GAWGXB2ENJPFYVWTJM/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.