CVE-2016-3995
The timing attack protection in Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec:...
CVE-2016-3995 is a high vulnerability (CVSS 7.5) in Cryptopp Crypto\+\+, published April 25, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.86%, the 79th percentile. Fixed in libcrypto++ 5.6.3-6.
The timing attack protection in Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec::ProcessAndXorBlock in Crypto++ (aka cryptopp) before 5.6.4 may be optimized out by the compiler, which allows attackers to conduct timing attacks.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
The timing attack protection in Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec::ProcessAndXorBlock in Crypto++ (aka cryptopp) before 5.6.4 may be optimized out by the compiler, which allows attackers to conduct timing attacks.
- Record
CVE-2016-3995- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
CVE List No score
The timing attack protection in Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec::ProcessAndXorBlock in Crypto++ (aka cryptopp) before 5.6.4 may be optimized out by the compiler, which allows attackers to conduct timing attacks.
- Record
CVE-2016-3995- Updated
- 2026-11-02
EUVDEUVD-2016-5004 No score
The timing attack protection in Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec::ProcessAndXorBlock in Crypto++ (aka cryptopp) before 5.6.4 may be optimized out by the compiler, which allows attackers to conduct timing attacks.
- Record
EUVD-2016-5004- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-rfvf-996j-mmvf
The timing attack protection in Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec:...
The timing attack protection in Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec::ProcessAndXorBlock in Crypto++ (aka cryptopp) before 5.6.4 may be optimized out by the compiler, which allows attackers to conduct timing attacks.
- Record
GHSA-rfvf-996j-mmvf- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
OSV
The timing attack protection in Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec::ProcessAndXorBlock in Crypto++ (aka cryptopp) before 5.6.4 may be optimized out by the compiler, which allows attackers to conduct timing attacks.
- Record
CVE-2016-3995- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVDEBIAN-CVE-2016-3995
The timing attack protection in Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec::ProcessAndXorBlock in Crypto++ (aka cryptopp) before 5.6.4 may be optimized out by the compiler, which allows attackers to conduct timing attacks.
- Record
DEBIAN-CVE-2016-3995- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-2016-3995
The timing attack protection in Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec::ProcessAndXorBlock in Crypto++ (aka cryptopp) before 5.6.4 may be optimized out by the compiler, which allows attackers to conduct timing attacks.
- Record
UBUNTU-CVE-2016-3995- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVMGASA-2016-0147 No score
Updated libcryptopp packages fix CVE-2016-3995
Updated libcryptopp packages fix security vulnerability:
In libcryptopp, for both Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec::ProcessAndXorBlock there is some code to avoid timing attacks, however it is removed by the compiler due to optimizations, making the binary vulnerable to timing attacks (CVE-2016-3995).
This update also corrects some bugs with the package.
- Record
MGASA-2016-0147- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
libcrypto++Debian:12 |
before 5.6.3-6 | 5.6.3-6 |
libcrypto++Debian:13 |
before 5.6.3-6 | 5.6.3-6 |
libcrypto++Debian:14 |
before 5.6.3-6 | 5.6.3-6 |
libcryptoppMageia:5 |
before 5.6.3-1.1.mga5 | 5.6.3-1.1.mga5 |
libcrypto++Ubuntu:14.04:LTS |
before 5.6.1-6+deb8u3build0.14.04.1, plus listed versions 5.6.1-65.6.1-6+deb8u1build0.14.04.1 |
5.6.1-6+deb8u3build0.14.04.1 |
libcrypto++Ubuntu:16.04:LTS |
before 5.6.1-9ubuntu0.1, plus listed versions 5.6.1-85.6.1-9 |
5.6.1-9ubuntu0.1 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD, OSV |