CVE-2018-3639
MediumExploitedPublic exploitSystems with microprocessors utilizing speculative execution and speculative execution of memory reads before the addresses of all prior memory writes are known may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis,…
Published May 22, 2018 · Updated Sep 9, 2026 · Also known as ALPINE-CVE-2018-3639, DEBIAN-CVE-2018-3639, DLA-1446-1, DSA-4210-1, DSA-4273-1, DSA-4273-2, SUSE-SU-2018:1362-1, SUSE-SU-2018:1362-2, SUSE-SU-2018:1377-1, SUSE-SU-2018:1377-2, SUSE-SU-2018:1378-1, SUSE-SU-2018:1389-1, SUSE-SU-2018:1452-1, SUSE-SU-2018:1475-1, SUSE-SU-2018:1479-1, SUSE-SU-2018:1582-1, SUSE-SU-2018:1614-1, SUSE-SU-2018:1614-2, SUSE-SU-2018:1926-1, SUSE-SU-2018:1935-1, SUSE-SU-2018:1935-2, SUSE-SU-2018:2076-1, SUSE-SU-2018:2304-1, SUSE-SU-2018:2331-1, SUSE-SU-2018:2331-2, SUSE-SU-2018:2335-1, SUSE-SU-2018:2338-1, SUSE-SU-2019:1211-1, SUSE-SU-2019:1211-2, SUSE-SU-2019:2028-1, SUSE-SU-2020:2540-1, SUSE-SU-2020:2605-1, SUSE-SU-2021:3007-1, SUSE-SU-2021:3969-1, SUSE-SU-2023:3349-1, UBUNTU-CVE-2018-3639, USN-3651-1, USN-3652-1, USN-3679-1, USN-3756-1
Key Facts
Patch immediately- CVE-2018-3639 is a medium-severity vulnerability (CVSS 5.5 v3.1) affecting openjdk8 (alpine), xen (alpine), arm-trusted-firmware (debian) and 22 more products.
- It is exploited in the wild, listed in Industry KEV feed since Feb 25, 2020 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 61% probability of exploitation in the next 30 days.
- Fixed versions are available, including arm-trusted-firmware 2.12.16+dfsg-1, arm-trusted-firmware 2.5-2.3, arm-trusted-firmware-tools 2.5-2.3.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS (30-day exploit likelihood)
61%
Higher than 99.1% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2018-3639 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Systems with microprocessors utilizing speculative execution and speculative execution of memory reads before the addresses of all prior memory writes are known may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB), Variant 4.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Feb 25, 2020 | n/a | Known |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
2,601 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| openjdk8alpine | See advisory | 8.181.13-r0 |
| xenalpine | See advisory | 4.11.0-r0 |
| arm-trusted-firmwaredebian | See advisory | 2.12.16+dfsg-1 |
| intel-microcodedebian | See advisory | 3.20180703.1 |
| linux-4.9debian | See advisory | 4.9.110-1~deb8u1 |
Patched Releases
arm-trusted-firmware
2.12.16+dfsg-1, 2.5-2.3
arm-trusted-firmware-tools
2.5-2.3
cluster-md-kmp-default
4.12.14-150.78.1, 4.12.14-25.3.1, 4.4.121-92.80.1, 4.4.131-94.29.1
cluster-md-kmp-rt
4.12.14-10.16.1, 4.4.138-3.14.1
cluster-network-kmp-default
4.4.121-92.80.1
dlm-kmp-default
4.12.14-150.78.1, 4.12.14-25.3.1, 4.4.121-92.80.1, 4.4.131-94.29.1
dlm-kmp-rt
4.12.14-10.16.1, 4.4.138-3.14.1
gfs2-kmp-default
4.12.14-150.78.1, 4.12.14-25.3.1, 4.4.121-92.80.1, 4.4.131-94.29.1
gfs2-kmp-rt
4.12.14-10.16.1, 4.4.138-3.14.1
intel-microcode
3.20180703.1, 3.20180703.2~deb8u1, 3.20180703.2~deb9u1, 3.20180807a.0ubuntu0.14.04.1, 3.20180807a.0ubuntu0.16.04.1, 3.20180807a.0ubuntu0.18.04.1, 3.20180807a.1~deb9u1
ivshmem-tools
15:3.0.0-1.el7, 15:3.1.0-1.el7
java
1.7.0-openjdk-1:1.7.0.181-2.6.14.8.el6_9, 1.8.0-openjdk-1:1.8.0.171-8.b10.el7_5
java-1_7_0-openjdk
1.7.0.201-43.18.1, 1.7.0.201-54.1, 1.7.0.231-43.27.2, 1.7.0.311-43.50.2
java-1_7_0-openjdk-accessibility
1.7.0.201-54.1
java-1_7_0-openjdk-bootstrap
1.7.0.201-54.1
java-1_7_0-openjdk-bootstrap-devel
1.7.0.201-54.1
java-1_7_0-openjdk-bootstrap-headless
1.7.0.201-54.1
java-1_7_0-openjdk-demo
1.7.0.201-43.18.1, 1.7.0.201-54.1, 1.7.0.231-43.27.2, 1.7.0.311-43.50.2
java-1_7_0-openjdk-devel
1.7.0.201-43.18.1, 1.7.0.201-54.1, 1.7.0.231-43.27.2, 1.7.0.311-43.50.2
java-1_7_0-openjdk-headless
1.7.0.201-43.18.1, 1.7.0.201-54.1, 1.7.0.231-43.27.2, 1.7.0.311-43.50.2
java-1_7_0-openjdk-javadoc
1.7.0.201-54.1
java-1_7_0-openjdk-src
1.7.0.201-54.1
java-1_8_0-openjdk
1.8.0.181-27.1, 1.8.0.181-27.26.2, 1.8.0.212-27.32.1, 1.8.0.212-3.19.1, 1.8.0.212-34.1, 1.8.0.212-lp150.2.16.1, 1.8.0.302-2.2
java-1_8_0-openjdk-accessibility
1.8.0.181-27.1, 1.8.0.212-34.1, 1.8.0.212-lp150.2.16.1, 1.8.0.302-2.2
java-1_8_0-openjdk-demo
1.8.0.181-27.1, 1.8.0.181-27.26.2, 1.8.0.212-27.32.1, 1.8.0.212-3.19.1, 1.8.0.212-34.1, 1.8.0.212-lp150.2.16.1, 1.8.0.302-2.2
Timeline
Publicly disclosed
May 22, 2018
Added to Industry KEV feed
Feb 25, 2020
Last updated
Sep 9, 2026
Weakness Type
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
- CWE-203 Observable Discrepancy
- CWE-226 Sensitive Information in Resource Not Removed Before Reuse
- CWE-385 Covert Timing Channel
References
- advisoryRHSA-2018:1629
- advisoryRHSA-2018:1630
- advisoryRHSA-2018:1632
- advisoryRHSA-2018:1633
- advisoryRHSA-2018:1635
FAQ
Common Questions.
Systems with microprocessors utilizing speculative execution and speculative execution of memory reads before the addresses of all prior memory writes are known may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB), Varian…
Affected: openjdk8 (alpine); xen (alpine); arm-trusted-firmware (debian), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Feb 25, 2020 and is known to be used in ransomware campaigns.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including arm-trusted-firmware 2.12.16+dfsg-1, arm-trusted-firmware 2.5-2.3, arm-trusted-firmware-tools 2.5-2.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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