CVE-2023-20593

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 5.2%, top 8% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 5%CVSS: 5.5Exploit: NoneExposed: 0

A fix is available — apply it.

An issue in “Zen 2” CPUs, under specific microarchitectural circumstances, may allow an attacker to potentially access sensitive information.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
—
EPSS
91.6%
KEV
Not listed

Published

July 24, 2023

Last Modified

February 13, 2025

References (70)

Vendor Advisories for CVE-2023-20593(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-lts-xenial (4.4.0.248.215) @ trusty2026-05-24ubuntu
ubuntulinux-tools-oracle (6.2.0.1010.10) @ lunar2026-05-24ubuntu
ubuntulinux-tools-oracle-edge (5.4.0.1107.116~18.04.79) @ bionic2026-05-24ubuntu
ubuntulinux-tools-gkeop-5.4 (5.4.0.1075.73) @ focal2026-05-24ubuntu
redhatlinux-firmware-0:20201218-105.git05789708.el8_42024-01-30redhat
redhatkernel-rt-0:4.18.0-193.120.1.rt13.171.el8_22024-01-25redhat
redhatkernel-0:4.18.0-193.120.1.el8_22024-01-25redhat
redhatlinux-firmware-0:20180911-69.2.git85c5d90.el7_62023-12-13redhat
redhatlinux-firmware-0:20190516-97.git711d3297.el8_12023-12-06redhat
redhatkernel-0:4.18.0-305.114.1.el8_42023-11-28redhat
redhatkernel-rt-0:4.18.0-305.114.1.rt7.190.el8_42023-11-28redhat
redhatlinux-firmware-0:20200421-81.git78c0348.el7_92023-11-27redhat
redhatkernel-0:5.14.0-70.80.1.el9_02023-11-21redhat
redhatkernel-rt-0:5.14.0-70.80.1.rt21.151.el9_02023-11-21redhat
redhatlinux-firmware-0:20220210-112.git6342082c.el8_62023-11-21redhat
redhatlinux-firmware-0:20190429-74.gitddde598.el7_72023-11-15redhat
redhatlinux-firmware-0:20220209-128.el9_02023-10-10redhat
redhatlinux-firmware-0:20191202-100.gite8a0f4c9.el8_22023-10-10redhat
redhatkernel-0:3.10.0-1062.79.1.el72023-10-03redhat
redhatkernel-rt-0:4.18.0-477.27.1.rt7.290.el8_82023-09-19redhat
redhatlinux-firmware-0:20230404-117.git2e92a49f.el8_82023-09-19redhat
redhatkernel-0:4.18.0-477.27.1.el8_82023-09-19redhat
redhatlinux-firmware-0:20230310-135.el9_22023-09-12redhat
redhatkernel-0:5.14.0-284.30.1.el9_22023-09-12redhat
redhatkernel-rt-0:5.14.0-284.30.1.rt14.315.el9_22023-09-12redhat
redhatkernel-0:3.10.0-1160.99.1.el72023-08-29redhat
redhatkernel-0:4.18.0-372.70.1.el8_62023-08-29redhat
redhatkernel-rt-0:3.10.0-1160.99.1.rt56.1245.el72023-08-29redhat
redhatkernel-0:3.10.0-957.105.1.el72023-08-22redhat
redhatkernel-0:3.10.0-693.112.1.el72023-08-22redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(19)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 106 total refreshes for this CVE.

  1. 2026-07-22 23:05 UTCEG score recompute
  2. 2026-07-22 14:06 UTCEPSS rescore
  3. 2026-07-21 15:23 UTCEPSS rescore
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  14. 2026-07-15 14:49 UTCOSV refresh
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  1. 2026-07-06 16:26 UTCEPSS rescore
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  9. 2026-06-30 23:21 UTCEPSS rescore
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  14. 2026-06-27 15:04 UTCOSV refresh
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  40. 2026-06-11 13:59 UTCEPSS rescore
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  42. 2026-06-10 22:17 UTCEPSS rescore
  43. 2026-06-10 13:21 UTCEPSS rescore
  44. 2026-06-10 13:21 UTCEPSS rescore
  45. 2026-06-10 01:17 UTCOSV refresh
  46. 2026-06-08 14:15 UTCEPSS rescore
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  48. 2026-06-07 15:23 UTCEPSS rescore
  49. 2026-06-07 15:23 UTCEPSS rescore
  50. 2026-06-06 13:46 UTCEPSS rescore
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCsbaresearch/stop-zenbleed-win
    First seen Jul 26, 2023

    PowerShell script to apply Zenbleed (CVE-2023-20593) MSR workaround on Windows

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-20593?
CVE-2023-20593 is a medium vulnerability published on July 24, 2023. An issue in “Zen 2” CPUs, under specific microarchitectural circumstances, may allow an attacker to potentially access sensitive information.
When was CVE-2023-20593 disclosed?
CVE-2023-20593 was first published in the National Vulnerability Database on July 24, 2023, with the most recent update on February 13, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-20593 actively exploited?
CVE-2023-20593 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-20593?
CVE-2023-20593 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2023-20593?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-20593, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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