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CVE-2018-12435

20
FAUCET Score

CVE-2018-12435 describes a memory-cache side-channel vulnerability, dubbed "Return Of the Hidden Number Problem" (ROHNP), affecting Botan versions 2.5.0 through 2.6.0. This flaw allows an attacker with local or same-host virtual machine access to potentially recover ECDSA private keys. Rated Medium severity (CVSS 5.9), exploitation requires high attack complexity but could lead to high confidentiality impact. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.5.0, <= 2.7.0CPE matchmatch criteria
cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.4
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.50%
Probability of exploitation in next 30 days
EPSS Percentile
39.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0050 is in the 76th percentile among its peer group of 1,595 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

botan.randombit.net / security.html
Third Party Advisory
github.com / randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3
PatchThird Party Advisory
nccgroup.trust / us/our-research/technical-advisory-return-of-the-hidden-number-problem
ExploitThird Party Advisory