No exploitation reportedFix available

CVE-2020-28491

Q: Is CVE-2020-28491 actively exploited?

Active exploitation of CVE-2020-28491 has not been confirmed. Its EPSS score was 3.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-28491?

CVE-2020-28491 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2021-02-18
Fixed in2.12.1 · 2.11.4
WeaknessCWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

This affects the package com.fasterxml.jackson.dataformat:jackson-dataformat-cbor from 0 and before 2.11.4, from 2.12.0-rc1 and before 2.12.1. Unchecked allocation of byte buffer can cause a java.lang.OutOfMemoryError exception.

Timeline

dates in UTC

2021-02-1816:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-28491?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-28491?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Fasterxml jackson-dataformats-binary

Branch	Affected	Fixed in	Source
2.12	> 2.12.0, < 2.12.1	2.12.1	NVD
2.11	< 2.11.4	2.11.4	NVD
2.12	= 2.12.0	no fix published	NVD

Oracle weblogic server

Branch	Affected	Fixed in	Source
12.2	= 12.2.1.3.0	no fix published	NVD
12.2	= 12.2.1.4.0	no fix published	NVD
14.1	= 14.1.1.0.0	no fix published	NVD

Quarkus

Branch	Affected	Fixed in	Source
2.0	< 2.0.2	2.0.2	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Fasterxml jackson-dataformats-binary to 2.12.1 · 2.11.4

Advisories and patches

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.17.5read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-770read 2026-10-23
FIRST EPSSEPSS score3.1 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2021-02-18
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-28491?

Is CVE-2020-28491 actively exploited?

Active exploitation of CVE-2020-28491 has not been confirmed. Its EPSS score was 3.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-28491?

CVE-2020-28491 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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