Vulnerability record · CVE-2018-12435 · published 15 June 2018

CVE-2018-12435: Botan project botan information exposure vulnerability

Botan Project · Botan

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.

5.9 CVSS 3.0 Medium EPSS 0.50% · top 59.5% CWE-200 · Information exposure

5.9CVSS 3.0 base score, v2 1.9

0.50%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

6References, 2 tagged exploit

17 Jun 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Botan Botan Project

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-24115Botan project botan vulnerabilityIn Botan before 2.17.3, constant-time computations are not used for certain decoding and encoding operations (base32, base58, base64, and hex).EPSS 2.0%22 Feb 2021 9.8CVE-2018-9127Botan project botan improper certificate validation vulnerabilityBotan 2.2.0 - 2.4.0 (fixed in 2.5.0) improperly handled wildcard certificates and could accept certain certificates as valid for hostnames when, unde…EPSS 0.93%2 Apr 2018 9.8CVE-2017-2801Botan project botan out-of-bounds read vulnerabilityA programming error exists in a way Randombit Botan cryptographic library version 2.0.1 implements x500 string comparisons which could lead to certif…EPSS 1.3%24 May 2017 9.8CVE-2016-6878Botan project botan improper input validation vulnerabilityThe Curve25519 code in botan before 1.11.31, on systems without a native 128-bit integer type, might allow attackers to have unspecified impact via v…EPSS 1.2%10 Apr 2017 9.8CVE-2015-7826Botan project botan improper certificate validation vulnerabilitybotan 1.11.x before 1.11.22 improperly handles wildcard matching against hostnames, which might allow remote attackers to have unspecified impact via…EPSS 1.1%10 Apr 2017 9.8CVE-2016-9132Botan project botan integer overflow vulnerabilityIn Botan 1.8.0 through 1.11.33, when decoding BER data an integer overflow could occur, which would cause an incorrect length field to be computed. S…EPSS 2.0%30 Jan 2017 9.8CVE-2016-2196Botan project botan memory buffer overflow vulnerabilityHeap-based buffer overflow in the P-521 reduction function in Botan 1.11.x before 1.11.27 allows remote attackers to cause a denial of service (memor…EPSS 5.3%13 May 2016 9.8CVE-2016-2195Botan project botan memory buffer overflow vulnerabilityInteger overflow in the PointGFp constructor in Botan before 1.10.11 and 1.11.x before 1.11.27 allows remote attackers to overwrite memory and possib…EPSS 6.7%13 May 2016

Source: NIST National Vulnerability Database (record CVE-2018-12435), CISA KEV, FIRST EPSS (scores of 2026-10-01). This page is refreshed as NVD updates the record.