Is CVE-2020-15254 in the CISA KEV catalog?

No. CVE-2020-15254 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-15254?

CVE-2020-15254 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2020-15254?

CVE-2020-15254 has an EPSS score of 2.74% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-15254?

Upgrade firefox on debian unstable to 82.0-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2020-15254

HIGHEPSS 84th pctl

8.1

CVSS v3

NVD

Description

Crossbeam is a set of tools for concurrent programming. In crossbeam-channel before version 0.4.4, the bounded channel incorrectly assumes that `Vec::from_iter` has allocated capacity that same as the number of iterator elements. `Vec::from_iter` does not actually guarantee that and may allocate extra memory. The destructor of the `bounded` channel reconstructs `Vec` from the raw pointer based on the incorrect assumes described above. This is unsound and causing deallocation with the incorrect capacity when `Vec::from_iter` has allocated different sizes with the number of iterator elements. This has been fixed in crossbeam-channel 0.4.4.

CWE-119Buffer Overflow CWE-401Missing Release of Memory (Memory Leak)

How to fix

Remediation Available

firefoxDebian

Fixed in:82.0-1CVE-2020-15254

firefoxUbuntu

Fixed in:82.0+build2-0ubuntu0.16.04.5USN-4599-2

Fixed in:82.0+build2-0ubuntu0.18.04.1USN-4599-1

Fixed in:82.0+build2-0ubuntu0.20.04.1USN-4599-1

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.74%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Patch2

Exploit1

github.com

Third-Party Advisory1

github.com

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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.