Is CVE-2020-12397 in the CISA KEV catalog?

No. CVE-2020-12397 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-12397?

CVE-2020-12397 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2020-12397?

CVE-2020-12397 has an EPSS score of 0.60% (44th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-12397?

Upgrade thunderbird on debian 11 to 1:68.8.0-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2020-12397

MEDIUM

4.3

CVSS v3

NVD

Description

By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. This vulnerability affects Thunderbird < 68.8.0.

CWE-346

How to fix

Remediation Available

thunderbirdDebian

Fixed in:1:68.8.0-1CVE-2020-12397

thunderbirdUbuntu

Fixed in:1:68.8.0+build2-0ubuntu0.16.04.2USN-4373-1

Fixed in:1:68.8.0+build2-0ubuntu0.18.04.2USN-4373-1

Fixed in:1:68.8.0+build2-0ubuntu0.20.04.2USN-4373-1

Mozilla Thunderbird (en-US)Windows application

Affected:68.8.0Fixed in:68.8.0Mozilla

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

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Exploit Intelligence

0.60%probability of exploitation in 30 days

44thpercentile

Moderate risk: more likely to be exploited than 44% of all known CVEs.

References

Patch1

bugzilla.mozilla.org

Vendor Advisory1

mozilla.org

Third-Party Advisory2

Related Vulnerabilities

Other CWE-346 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-1185	High	7.2	82%	-	Fix
CVE-2025-34291	High	8.8	79%	KEV	-
CVE-2020-16952	High	8.6	71%	-	-
CVE-2023-29711	Critical	9.8	70%	-	-
CVE-2015-4495	High	8.8	70%	KEV	Fix
CVE-2024-23898	High	8.8	67%	-	Fix

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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.