HOMEVULNERABILITIESCVE-2018-5243
HIGH

CVE-2018-5243

CWE-400Published: August 20, 2018· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

The Symantec Encryption Management Server (SEMS) product, prior to version 3.4.2 MP1, may be susceptible to a denial of service (DoS) exploit. A DoS attack is a type of attack whereby the perpetrator attempts to make a particular machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a specific host within a network.

NVD Source

Technical Analysis

CVE-2018-5243 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

symantec1 product(s)
encryption management server
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

ADVISORYhttp://www.securityfocus.com/bid/105062
ADVISORYhttp://www.securitytracker.com/id/1041527
ADVISORYhttps://support.symantec.com/en_US/article.SYMSA1458.html
ADVISORYhttp://www.securityfocus.com/bid/105062
ADVISORYhttp://www.securitytracker.com/id/1041527
ADVISORYhttps://support.symantec.com/en_US/article.SYMSA1458.html

All References (6)

→
http://www.securityfocus.com/bid/105062Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1041527Third Party Advisory · VDB Entry
→
https://support.symantec.com/en_US/article.SYMSA1458.htmlMitigation · Vendor Advisory
→
http://www.securityfocus.com/bid/105062Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1041527Third Party Advisory · VDB Entry
→
https://support.symantec.com/en_US/article.SYMSA1458.htmlMitigation · Vendor Advisory

Quick Facts

CVE IDCVE-2018-5243
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-400
CISA KEVNo
Affected1 vendor(s)
PublishedAug 20, 2018

Related CVEs (CWE-400)

CVE-2019-10750
9.8
CVE-2022-48716
9.8
CVE-2019-2259
9.8
CVE-2019-10747
9.8
CVE-2024-36543
9.8
CVE-2024-39462
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-5243 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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