CVE-2018-11615: This vulnerability allows remote attackers to deny service on vulnerable installations of npm mosca 2.8.1

Q: How do I fix CVE-2018-11615?

mosca: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2018-11615 being exploited?

CVE-2018-11615 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-11615 affect?

CVE-2018-11615 affects mosca. Severity is high (CVSS 7.5). This vulnerability allows remote attackers to deny service on vulnerable installations of npm mosca 2.8.1. Authentication is not required to exploit this vulnerability. The specific flaw exists within the processing of topics. A crafted reg

Q: How urgent is CVE-2018-11615?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2018-11615 is a high-severity flaw (CVSS 7.5) affecting mosca. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This vulnerability allows remote attackers to deny service on vulnerable installations of npm mosca 2.8.1. Authentication is not required to exploit this vulnerability. The specific flaw exists within the processing of topics. A crafted regular expression can cause the broker to crash. An attacker can leverage this vulnerability to deny access to the target system. Was ZDI-CAN-6306.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.3% (top 11%)
CISA exploited list	No
Weakness	CWE-20, CWE-185
Published	2018-08-30
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: mosca project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-08-30 12:29 UTCPublished CVE record published
2026-06-17 01:36 UTCUpdated Record last modified

mosca project mosca DOWNGRADE

Affected: 2.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.8.1

1. Check installed version

npm ls mosca

2. No fixed release: DOWNGRADE to a release before 2.8.1

npm view mosca versions npm install mosca@"<2.8.1"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-11615?

mosca: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-11615 being exploited?

CVE-2018-11615 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-11615 affect?

CVE-2018-11615 affects mosca. Severity is high (CVSS 7.5). This vulnerability allows remote attackers to deny service on vulnerable installations of npm mosca 2.8.1. Authentication is not required to exploit this vulnerability. The specific flaw exists within the processing of topics. A crafted reg

How urgent is CVE-2018-11615?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

References

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