HOMEVULNERABILITIESCVE-2018-9862
HIGH

CVE-2018-9862

CWE-838Published: April 9, 2018· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

util.c in runV 1.0.0 for Docker mishandles a numeric username, which allows attackers to obtain root access by leveraging the presence of an initial numeric value on an /etc/passwd line, and then issuing a "docker exec" command with that value in the -u argument, a similar issue to CVE-2016-3697.

NVD Source

Technical Analysis

CVE-2018-9862 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

hyper1 product(s)
runv
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/hyperhq/hyperstart/pull/348
PATCHhttps://github.com/hyperhq/hyperstart/pull/348
ADVISORYhttp://www.securityfocus.com/bid/103738
ADVISORYhttp://www.securityfocus.com/bid/103738

All References (4)

→
http://www.securityfocus.com/bid/103738Broken Link · Third Party Advisory · VDB Entry
→
https://github.com/hyperhq/hyperstart/pull/348Patch · Third Party Advisory
→
http://www.securityfocus.com/bid/103738Broken Link · Third Party Advisory · VDB Entry
→
https://github.com/hyperhq/hyperstart/pull/348Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2018-9862
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-838
CISA KEVNo
Affected1 vendor(s)
PublishedApr 9, 2018

Related CVEs (CWE-838)

CVE-2019-18981
9.8
CVE-2025-4052
9.8
CVE-2024-11702
7.5
CVE-2019-6110
6.8
CVE-2023-5770
5.4
CVE-2020-7292
4.3

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-9862 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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