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Vulnerability details: VCID-vbr8-9fcm-1qha
Vulnerability ID VCID-vbr8-9fcm-1qha
Aliases CVE-2018-16868
Summary A Bleichenbacher type side-channel based padding oracle attack was found in the way gnutls handles verification of RSA decrypted PKCS#1 v1.5 data. An attacker who is able to run process on the same physical core as the victim process, could use this to extract plaintext or in some cases downgrade any TLS connections to a vulnerable server.
Status Published
Exploitability 0.5
Weighted Severity 5.0
Risk 2.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-203 Observable Discrepancy
System Score Found at
cvssv3 4.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-16868.json
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00098 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00098 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
epss 0.00098 https://api.first.org/data/v1/epss?cve=CVE-2018-16868
cvssv3 5.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 3.3 https://nvd.nist.gov/vuln/detail/CVE-2018-16868
cvssv3.1 5.6 https://nvd.nist.gov/vuln/detail/CVE-2018-16868
Reference id Reference type URL
http://cat.eyalro.net/
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00068.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-16868.json
https://api.first.org/data/v1/epss?cve=CVE-2018-16868
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16868
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16868
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
http://www.securityfocus.com/bid/106080
1654929 https://bugzilla.redhat.com/show_bug.cgi?id=1654929
cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:*
CVE-2018-16868 https://nvd.nist.gov/vuln/detail/CVE-2018-16868
No exploits are available.
Vector: CVSS:3.0/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-16868.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:L/AC:M/Au:N/C:P/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-16868
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-16868
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.1756
EPSS Score 0.00056
Published At Aug. 2, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:59:05.083002+00:00 NVD Importer Import https://nvd.nist.gov/vuln/detail/CVE-2018-16868 37.0.0