Is CVE-2018-18509 in the CISA KEV catalog?

No. CVE-2018-18509 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-18509?

CVE-2018-18509 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2018-18509?

CVE-2018-18509 has an EPSS score of 1.68% (74th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-18509?

Upgrade thunderbird on debian 11 to 1:60.5.1-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2018-18509

MEDIUMEPSS 74th pctl

5.3

CVSS v3

NVD

Description

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with arbitrary content. This vulnerability affects Thunderbird < 60.5.1.

CWE-347

How to fix

Remediation Available

thunderbirdDebian

Fixed in:1:60.5.1-1CVE-2018-18509

thunderbirdUbuntu

Fixed in:1:60.5.1+build2-0ubuntu0.14.04.1USN-3897-1

Fixed in:1:60.5.1+build2-0ubuntu0.16.04.1USN-3897-1

Fixed in:1:60.5.1+build2-0ubuntu0.18.04.1USN-3897-1

Mozilla Thunderbird (en-US)Windows application

Affected:60.5.1Fixed in:60.5.1Mozilla

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.68%probability of exploitation in 30 days

74thpercentile

Elevated risk: more likely to be exploited than 74% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory3

Other references4

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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 2024-11-21.