CVE-2018-12435: botan_project botan
Vulnerability summary
CVE-2018-12435 is a medium (CVSS 5.9) vulnerability in botan_project botan. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.8% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 15-06-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated5.9MediumCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
EPSS trend
Probability
0.50%
Chance of exploitation in the next 30 days
Percentile
42%
Versus all other CVEs
30-day change
-0.01 pp
From 0.51% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (nccgroup.trust)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- botan≥ 2.5.0, < 2.7.0-r0
Botan_project1 product
- botan≥ 2.5.0, ≤ 2.7.0
Debian1 product
- botan< 2.6.0-3
3 vendors · 3 products
References
5 links- www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/X Refsource MISCExploitThird Party Advisory
- github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3X Refsource CONFIRMPatchThird Party Advisory
