What’s Vulnerable › Vulnerabilities

CVE-2018-12435

• Severity: medium (CVSS 5.9 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-06-15 · updated 2026-06-17
• Weakness: CWE-200

Description

Botan 2.5.0 through 2.6.0 before 2.7.0 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP, related to dsa/dsa.cpp, ec_group/ec_group.cpp, and ecdsa/ecdsa.cpp. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

Affected products

• randombit botan: from 2.5.0 through 2.7.0

References

• https://botan.randombit.net/security.html
• https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3
• https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/
• https://botan.randombit.net/security.html
• https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3
• https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/

Get alerted when CVE-2018-12435 or the next vulnerability affects your stack