CVE-2018-12435
lowpriority · track · 24EPSS 0.005 · 42 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.9–5.9
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (8)
External citations — patches, advisories, analysis.
- https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3cnnvd
- https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/cnnvd
- https://botan.randombit.net/security.htmlenisa_euvd
- https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3enisa_euvd
- https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/enisa_euvd
- https://botan.randombit.net/security.htmlThird Party Advisorynvd
- https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3PatchThird Party Advisorynvd
- https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ExploitThird Party Advisorynvd
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