Is CVE-2018-6540 in the CISA KEV catalog?

No. CVE-2018-6540 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-6540?

CVE-2018-6540 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2018-6540?

CVE-2018-6540 has an EPSS score of 2.31% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-6540?

Upgrade zziplib on debian 11 to 0.13.62-3.2 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2018-6540

MEDIUMEPSS 81th pctl

6.5

CVSS v3

NVD

Description

In ZZIPlib 0.13.67, there is a bus error caused by loading of a misaligned address in the zzip_disk_findfirst function of zzip/mmapped.c. Remote attackers could leverage this vulnerability to cause a denial of service via a crafted zip file.

How to fix

Remediation Available

zziplibDebian

Fixed in:0.13.62-3.2CVE-2018-6540

libzzip-0-13Ubuntu

Fixed in:0.13.62-2ubuntu0.2USN-3699-1

Fixed in:0.13.62-3ubuntu0.16.04.2USN-3699-1

Fixed in:0.13.62-3.1ubuntu0.18.04.1USN-3699-1

zziplibUbuntu

Fixed in:0.13.62-2ubuntu0.2USN-3699-1

Fixed in:0.13.62-3ubuntu0.16.04.2USN-3699-1

Fixed in:0.13.62-3.1ubuntu0.18.04.1USN-3699-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

2.31%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Exploit1

github.com

Third-Party Advisory1

usn.ubuntu.com

Other references1

lists.debian.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-07-10.