CVE-2018-12435

Exp

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.

Published: 2018-06-15 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-12435 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.07%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2018-12435

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2018-12435

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-26 0.15% 0.07% -0.08%
2 2025-11-21 0.07% 0.15% +0.08%
3 2025-11-18 — 0.07% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-12435

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.0 MEDIUM
CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.4 4.0 [email protected]
1.9 2.0 LOW
AV:L/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.4 2.9 [email protected]

Weakness enumeration for CVE-2018-12435

OS Trackers for CVE-2018-12435

vendor priority summary link
alpine medium CVE-2018-12435: 1 source package rows (botan); 16 state rows across 8 repos (3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, edge-main); fixed 8, open 8. https://security.alpinelinux.org/vuln/CVE-2018-12435
debian not yet assigned CVE-2018-12435 not yet assigned priority: Debian including 1 source packages (botan), 3 status rows across 3 suites (bookworm, bullseye, trixie): resolved 3. https://security-tracker.debian.org/tracker/CVE-2018-12435
suse medium CVE-2018-12435 severity moderate: SUSE including 11 source package names (Botan, Botan-2.18.1-1.3, …), 13 product×package rows across 3 product lines (SUSE Linux Enterprise Software Development Kit 11 SP4, SUSE Linux Enterprise Software Development Kit 12 SP3, openSUSE Tumbleweed): Fixed 7, Known Not Affected 6. https://www.suse.com/security/cve/CVE-2018-12435/
ubuntu medium CVE-2018-12435 medium priority: Ubuntu including 2 source packages (botan, botan1.10), 16 status rows across 8 suites (artful, bionic, cosmic, disco, eoan, trusty, upstream, xenial): not-affected 8, DNE 5, ignored 2, released 1. https://ubuntu.com/security/CVE-2018-12435

Affected software / configurations for CVE-2018-12435

Vendor Product Version Raw CPE
botan_project botan >= 2.5.0, <= 2.7.0 cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*

References for CVE-2018-12435

cvelogic Threat Intelligence