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.
Conclusion & alert: CVE-2018-3639 is rated High Exploit Risk (71.9/100): CVSS Medium severity, with high exploitation likelihood (EPSS 46.73%, 98th percentile). Core evidence: 3 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: 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.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| 44695 | exploit_db | edb | 2018-05-22 | Exploit-DB ↗ |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ | |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
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 | 2026-05-30 | 46.02% | 46.73% | +0.72% |
| 2 | 2026-05-22 | 48.64% | 46.02% | -2.63% |
| 3 | 2026-05-16 | — | 48.64% | — |
Full EPSS history (29 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.5 | 3.1 | MEDIUM |
|
1.8 | 3.6 | [email protected] |
| 5.5 | 3.1 | MEDIUM |
|
1.8 | 3.6 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| 2.1 | 2.0 | LOW |
|
3.9 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
medium | CVE-2018-3639: 2 source package rows (openjdk8, xen); 17 state rows across 17 repos (3.10-main, 3.11-main, 3.12-main, 3.17-community, 3.17-main, 3.18-community, 3.18-main, 3.19-community, 3.19-main, 3.20-community, 3.20-main, 3.21-community, 3.21-main, 3.22-community, 3.22-main, edge-community, edge-main); fixed 17, open 0. | https://security.alpinelinux.org/vuln/CVE-2018-3639 |
debian
|
not yet assigned | CVE-2018-3639 not yet assigned priority: Debian including 3 source packages (intel-microcode, linux, xen), 15 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 15. | https://security-tracker.debian.org/tracker/CVE-2018-3639 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2018-3639 |
suse
|
medium | — | https://www.suse.com/security/cve/CVE-2018-3639/ |
ubuntu
|
medium | CVE-2018-3639 medium priority: Ubuntu including 184 source packages (intel-microcode, libvirt, …), 2565 status rows across 20 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1960, not-affected 342, released 229, ignored 28, needed 4, needs-triage 2. | https://ubuntu.com/security/CVE-2018-3639 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| intel | atom_c | c2308 | cpe:2.3:h:intel:atom_c:c2308:*:*:*:*:*:*:* |
| intel | atom_c | c3308 | cpe:2.3:h:intel:atom_c:c3308:*:*:*:*:*:*:* |
| intel | atom_c | c3338 | cpe:2.3:h:intel:atom_c:c3338:*:*:*:*:*:*:* |
| intel | atom_c | c3508 | cpe:2.3:h:intel:atom_c:c3508:*:*:*:*:*:*:* |
| intel | atom_c | c3538 | cpe:2.3:h:intel:atom_c:c3538:*:*:*:*:*:*:* |
| intel | atom_c | c3558 | cpe:2.3:h:intel:atom_c:c3558:*:*:*:*:*:*:* |
| intel | atom_c | c3708 | cpe:2.3:h:intel:atom_c:c3708:*:*:*:*:*:*:* |
| intel | atom_c | c3750 | cpe:2.3:h:intel:atom_c:c3750:*:*:*:*:*:*:* |
| intel | atom_c | c3758 | cpe:2.3:h:intel:atom_c:c3758:*:*:*:*:*:*:* |
| intel | atom_c | c3808 | cpe:2.3:h:intel:atom_c:c3808:*:*:*:*:*:*:* |
| intel | atom_c | c3830 | cpe:2.3:h:intel:atom_c:c3830:*:*:*:*:*:*:* |
| intel | atom_c | c3850 | cpe:2.3:h:intel:atom_c:c3850:*:*:*:*:*:*:* |
| intel | atom_c | c3858 | cpe:2.3:h:intel:atom_c:c3858:*:*:*:*:*:*:* |
| intel | atom_c | c3950 | cpe:2.3:h:intel:atom_c:c3950:*:*:*:*:*:*:* |
| intel | atom_c | c3955 | cpe:2.3:h:intel:atom_c:c3955:*:*:*:*:*:*:* |
| intel | atom_c | c3958 | cpe:2.3:h:intel:atom_c:c3958:*:*:*:*:*:*:* |
| intel | atom_e | e3805 | cpe:2.3:h:intel:atom_e:e3805:*:*:*:*:*:*:* |
| intel | atom_e | e3815 | cpe:2.3:h:intel:atom_e:e3815:*:*:*:*:*:*:* |
| intel | atom_e | e3825 | cpe:2.3:h:intel:atom_e:e3825:*:*:*:*:*:*:* |
| intel | atom_e | e3826 | cpe:2.3:h:intel:atom_e:e3826:*:*:*:*:*:*:* |
| intel | atom_e | e3827 | cpe:2.3:h:intel:atom_e:e3827:*:*:*:*:*:*:* |
| intel | atom_e | e3845 | cpe:2.3:h:intel:atom_e:e3845:*:*:*:*:*:*:* |
| intel | atom_x5-e3930 | — | cpe:2.3:h:intel:atom_x5-e3930:-:*:*:*:*:*:*:* |
| intel | atom_x5-e3940 | — | cpe:2.3:h:intel:atom_x5-e3940:-:*:*:*:*:*:*:* |
| intel | atom_x7-e3950 | — | cpe:2.3:h:intel:atom_x7-e3950:-:*:*:*:*:*:*:* |
| intel | atom_z | z2420 | cpe:2.3:h:intel:atom_z:z2420:*:*:*:*:*:*:* |
| intel | atom_z | z2460 | cpe:2.3:h:intel:atom_z:z2460:*:*:*:*:*:*:* |
| intel | atom_z | z2480 | cpe:2.3:h:intel:atom_z:z2480:*:*:*:*:*:*:* |
| intel | atom_z | z2520 | cpe:2.3:h:intel:atom_z:z2520:*:*:*:*:*:*:* |
| intel | atom_z | z2560 | cpe:2.3:h:intel:atom_z:z2560:*:*:*:*:*:*:* |
| intel | atom_z | z2580 | cpe:2.3:h:intel:atom_z:z2580:*:*:*:*:*:*:* |
| intel | atom_z | z2760 | cpe:2.3:h:intel:atom_z:z2760:*:*:*:*:*:*:* |
| intel | atom_z | z3460 | cpe:2.3:h:intel:atom_z:z3460:*:*:*:*:*:*:* |
| intel | atom_z | z3480 | cpe:2.3:h:intel:atom_z:z3480:*:*:*:*:*:*:* |
| intel | atom_z | z3530 | cpe:2.3:h:intel:atom_z:z3530:*:*:*:*:*:*:* |
| intel | atom_z | z3560 | cpe:2.3:h:intel:atom_z:z3560:*:*:*:*:*:*:* |
| intel | atom_z | z3570 | cpe:2.3:h:intel:atom_z:z3570:*:*:*:*:*:*:* |
| intel | atom_z | z3580 | cpe:2.3:h:intel:atom_z:z3580:*:*:*:*:*:*:* |
| intel | atom_z | z3590 | cpe:2.3:h:intel:atom_z:z3590:*:*:*:*:*:*:* |
| intel | atom_z | z3735d | cpe:2.3:h:intel:atom_z:z3735d:*:*:*:*:*:*:* |
| intel | atom_z | z3735e | cpe:2.3:h:intel:atom_z:z3735e:*:*:*:*:*:*:* |
| intel | atom_z | z3735f | cpe:2.3:h:intel:atom_z:z3735f:*:*:*:*:*:*:* |
| intel | atom_z | z3735g | cpe:2.3:h:intel:atom_z:z3735g:*:*:*:*:*:*:* |
| intel | atom_z | z3736f | cpe:2.3:h:intel:atom_z:z3736f:*:*:*:*:*:*:* |
| intel | atom_z | z3736g | cpe:2.3:h:intel:atom_z:z3736g:*:*:*:*:*:*:* |
| intel | atom_z | z3740 | cpe:2.3:h:intel:atom_z:z3740:*:*:*:*:*:*:* |
| intel | atom_z | z3740d | cpe:2.3:h:intel:atom_z:z3740d:*:*:*:*:*:*:* |
| intel | atom_z | z3745 | cpe:2.3:h:intel:atom_z:z3745:*:*:*:*:*:*:* |
| intel | atom_z | z3745d | cpe:2.3:h:intel:atom_z:z3745d:*:*:*:*:*:*:* |
| intel | atom_z | z3770 | cpe:2.3:h:intel:atom_z:z3770:*:*:*:*:*:*:* |
| intel | atom_z | z3770d | cpe:2.3:h:intel:atom_z:z3770d:*:*:*:*:*:*:* |
| intel | atom_z | z3775 | cpe:2.3:h:intel:atom_z:z3775:*:*:*:*:*:*:* |
| intel | atom_z | z3775d | cpe:2.3:h:intel:atom_z:z3775d:*:*:*:*:*:*:* |
| intel | atom_z | z3785 | cpe:2.3:h:intel:atom_z:z3785:*:*:*:*:*:*:* |
| intel | atom_z | z3795 | cpe:2.3:h:intel:atom_z:z3795:*:*:*:*:*:*:* |
| intel | celeron_j | j3455 | cpe:2.3:h:intel:celeron_j:j3455:*:*:*:*:*:*:* |
| intel | celeron_j | j4005 | cpe:2.3:h:intel:celeron_j:j4005:*:*:*:*:*:*:* |
| intel | celeron_j | j4105 | cpe:2.3:h:intel:celeron_j:j4105:*:*:*:*:*:*:* |
| intel | celeron_n | n3450 | cpe:2.3:h:intel:celeron_n:n3450:*:*:*:*:*:*:* |
| intel | core_i3 | 32nm | cpe:2.3:h:intel:core_i3:32nm:*:*:*:*:*:*:* |
| intel | core_i3 | 45nm | cpe:2.3:h:intel:core_i3:45nm:*:*:*:*:*:*:* |
| intel | core_i5 | 32nm | cpe:2.3:h:intel:core_i5:32nm:*:*:*:*:*:*:* |
| intel | core_i5 | 45nm | cpe:2.3:h:intel:core_i5:45nm:*:*:*:*:*:*:* |
| intel | core_i7 | 32nm | cpe:2.3:h:intel:core_i7:32nm:*:*:*:*:*:*:* |
| intel | core_i7 | 45nm | cpe:2.3:h:intel:core_i7:45nm:*:*:*:*:*:*:* |
| intel | core_m | 32nm | cpe:2.3:h:intel:core_m:32nm:*:*:*:*:*:*:* |
| intel | core_m | 45nm | cpe:2.3:h:intel:core_m:45nm:*:*:*:*:*:*:* |
| intel | pentium | n4000 | cpe:2.3:h:intel:pentium:n4000:*:*:*:*:*:*:* |
| intel | pentium | n4100 | cpe:2.3:h:intel:pentium:n4100:*:*:*:*:*:*:* |
| intel | pentium | n4200 | cpe:2.3:h:intel:pentium:n4200:*:*:*:*:*:*:* |
| intel | pentium_j | j4205 | cpe:2.3:h:intel:pentium_j:j4205:*:*:*:*:*:*:* |
| intel | pentium_silver | j5005 | cpe:2.3:h:intel:pentium_silver:j5005:*:*:*:*:*:*:* |
| intel | pentium_silver | n5000 | cpe:2.3:h:intel:pentium_silver:n5000:*:*:*:*:*:*:* |
| intel | xeon_e-1105c | — | cpe:2.3:h:intel:xeon_e-1105c:-:*:*:*:*:*:*:* |
| intel | xeon_e3 | 125c_ | cpe:2.3:h:intel:xeon_e3:125c_:*:*:*:*:*:*:* |
| intel | xeon_e3 | 1220_ | cpe:2.3:h:intel:xeon_e3:1220_:*:*:*:*:*:*:* |
| intel | xeon_e3 | 1275_ | cpe:2.3:h:intel:xeon_e3:1275_:*:*:*:*:*:*:* |
| intel | xeon_e3 | 1505m_v6 | cpe:2.3:h:intel:xeon_e3:1505m_v6:*:*:*:*:*:*:* |
| intel | xeon_e3 | 1515m_v5 | cpe:2.3:h:intel:xeon_e3:1515m_v5:*:*:*:*:*:*:* |
| intel | xeon_e3 | 1535m_v5 | cpe:2.3:h:intel:xeon_e3:1535m_v5:*:*:*:*:*:*:* |