CVE-2019-18903

Service crash via freed IA_PD list insertion

Published Mar 2, 2020 · Updated Sep 17, 2024

Use-after-free in wicked on affected SUSE and openSUSE releases allows remote attackers to crash the DHCPv6 service. The client frees an IA_PD association when received lifetimes have T1 greater than T2, but then inserts the freed object into its prefix-delegation list. A crafted DHCPv6 reply must reach a host using wicked for DHCPv6; SUSE also reports potential code execution as an additional consequence.

CVSS severity7.5
High
EPSS probability2.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in wicked on affected SUSE and openSUSE releases allows remote attackers to crash the DHCPv6 service. The client frees an IA_PD association when received lifetimes have T1 greater than T2, but then inserts the freed object into its prefix-delegation list. A crafted DHCPv6 reply must reach a host using wicked for DHCPv6; SUSE also reports potential code execution as an additional consequence.

The record

CVE
CVE-2019-18903
Published
Mar 2, 2020
Updated
Sep 17, 2024
Vendor
OpenSUSE
Product
openSUSE Leap
Classifications
CWE-416, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 2, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=wicked <0.6.60-lp151.2.9.1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

OpenSUSE · openSUSE Leapversion=wicked <0.6.60-lp151.2.9.1
SUSE · SUSE Linux Enterprise Serverversion=wicked <0.6.60-2.18.1; version=wicked <0.6.60-28.26.1
OpenSUSE · openSUSE Factoryversion=wicked <0.6.62

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
6.5SUSE security portalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
7.5SUSE CNACVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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