gnutls: Bleichenbacher-like side channel leakage in PKCS#1 v1.5 verification and padding oracle verification
Published Dec 3, 2018
5.6
MEDIUMCVSS 3.1
EPSS 0.58%
Description
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.
Affected products
- Vendor n/a Product Gnutls Defaultn/a
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||
|---|---|---|---|---|---|---|
| n/a | Gnutls | n/a |
|
No data.
Red Hat Enterprise Linux 5
gnutls
Will not fix
Red Hat Enterprise Linux 6
gnutls
Will not fix
Red Hat Enterprise Linux 7
gnutls
Will not fix
Red Hat Enterprise Linux 8
gnutls
Not affected
Red Hat Enterprise Linux 8
mingw-gnutls
Not affected
Red Hat Virtualization 4
redhat-virtualization-host
Will not fix
Red Hat Virtualization 4
rhvm-appliance
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | gnutls | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | gnutls | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | gnutls | Will not fix | n/a |
| Red Hat Enterprise Linux 8 | gnutls | Not affected | n/a |
| Red Hat Enterprise Linux 8 | mingw-gnutls | Not affected | n/a |
| Red Hat Virtualization 4 | redhat-virtualization-host | Will not fix | n/a |
| Red Hat Virtualization 4 | rhvm-appliance | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
CVSS:3.0/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N
AV:L/AC:M/Au:N/C:P/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.58% (0.00577) | 45.54th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.57% (0.00573) | 42.59th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.10% (0.00098) | 24.98th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.05% (0.00049) | 20.09th | v3 (v2023.03.01) |
| May 21, 2024 | 0.05% (0.00049) | 17.57th | v3 (v2023.03.01) |
| Nov 27, 2023 | 0.05% (0.00049) | 15.57th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00045) | 12.21th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00950) | 32.28th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00950) | 13.46th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.25% (0.01247) | 30.57th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.25% (0.01247) | 0.00th | v1 |
References (9)
- http://cat.eyalro.net/ x_refsource_MISCTechnical DescriptionThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00017.html vendor-advisoryx_refsource_SUSEBroken LinkMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00068.html vendor-advisoryx_refsource_SUSEBroken LinkMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/106080 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2018-16868 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1654929 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16868 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-16868
- https://www.cve.org/CVERecord?id=CVE-2018-16868
| Link | Providers | Tags |
|---|---|---|
| http://cat.eyalro.net/ | x_refsource_MISCTechnical DescriptionThird Party Advisory | |
| http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00017.html | vendor-advisoryx_refsource_SUSEBroken LinkMailing ListThird Party Advisory | |
| http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00068.html | vendor-advisoryx_refsource_SUSEBroken LinkMailing ListThird Party Advisory | |
| http://www.securityfocus.com/bid/106080 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2018-16868 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1654929 | Issue Tracking | |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16868 | x_refsource_CONFIRMIssue TrackingThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-16868 | ||
| https://www.cve.org/CVERecord?id=CVE-2018-16868 |
Change history (0)
No recorded changes yet.