CVE-2020-2558Network attack vector

Unauthenticated service interruption via undisclosed SMB flaw

Published Jan 15, 2020 · Updated Sep 30, 2024

Kernel denial of service in Oracle Solaris 11 allows remote attackers to interrupt service through unauthenticated SMB traffic. Oracle identifies the affected locus only as the kernel and does not disclose the malformed SMB operation or implementation error that triggers the availability loss. The SMB service must be network-reachable; successful exploitation causes only a partial service interruption, with no reported data disclosure or modification.

CVSS severity5.8
Medium
EPSS probability1.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Kernel denial of service in Oracle Solaris 11 allows remote attackers to interrupt service through unauthenticated SMB traffic. Oracle identifies the affected locus only as the kernel and does not disclose the malformed SMB operation or implementation error that triggers the availability loss. The SMB service must be network-reachable; successful exploitation causes only a partial service interruption, with no reported data disclosure or modification.

The record

CVE
CVE-2020-2558
Published
Jan 15, 2020
Updated
Sep 30, 2024
Vendor
Oracle
Product
Oracle Solaris
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 30, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle · Oracle Solarisversion=11

Published CVSS scores

5.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
5.8OracleCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
5.0NISTAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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