CVE Intelligence
High Denial of service

CVE-2020-28491 — Denial of Service (DoS)

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.

Published Feb 18, 2021 · Updated Oct 27, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: snyk

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 3.1% (30-day exploitation probability)+13
  • Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
3.07%
ahead of 88% of scored CVEs · Oct 29, 2026
Affects
Fasterxml
Jackson-dataformats-binary and 3 more
CVSS base
7.5
High · 4 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

  • Documented patch — github.com (NIST National Vulnerability Database)
  • Documented patch — github.com (NIST National Vulnerability Database)
  • Documented patch — snyk.io (NIST National Vulnerability Database)
  • Documented patch — www.oracle.com (NIST National Vulnerability Database)
  • Maven Com.fasterxml.jackson.dataformat:jackson-dataformat-cbor: fixed in version 2.11.4 — github.com (GitHub Security Advisories)
  • Maven Com.fasterxml.jackson.dataformat:jackson-dataformat-cbor: fixed in version 2.12.1 — github.com (GitHub Security Advisories)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Fasterxml Jackson-dataformats-binary, Oracle Weblogic Server, Quarkus Quarkus…).
  2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
  3. Apply the fixed version or the patch documented under Remediation.
  4. Search available logs for exploit probes matching the vulnerability class (denial of service), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Fasterxml Jackson-dataformats-binary < 2.11.4> 2.12.0 and < 2.12.1version 2.12.0version 2.12.0-rc1version 2.12.0-rc2 Vulnerable NIST National Vulnerability Database
Oracle Weblogic Server version 12.2.1.3.0version 12.2.1.4.0version 14.1.1.0.0 Vulnerable NIST National Vulnerability Database
Quarkus Quarkus < 2.0.2 Vulnerable NIST National Vulnerability Database
Maven Com.fasterxml.jackson.dataformat:jackson-dataformat-cbor ≥ 2.8.0rc1 and < 2.11.4≥ 2.12.0rc1 and < 2.12.1 Vulnerable GitHub Security Advisories

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
7.5 CVSS 3.1 High 3.9 3.6 report@snyk.io via NIST National Vulnerability Database
7.5 CVSS 3.1 High 3.9 3.6 nvd@nist.gov via NIST National Vulnerability Database
7.5 CVSS 3.1 High — — GitHub, Inc. via GitHub Security Advisories
7.5 CVSS 3.1 High — — snyk via CVE Program (cve.org) e CISA ADP
5.0 CVSS 2.0 Medium 10.0 2.9 nvd@nist.gov via NIST National Vulnerability Database
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-770 · Allocation of Resources Without Limits or Throttling

Other CVEs with this weakness →

EPSS over time FIRST

Oct 27, 2026 → Oct 29, 2026 · 3 reading(s) · max 3.07%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Track CPU/memory spikes and availability drops correlated with request patterns.
web/proxy/WAF logsnetwork IDS/IPSresource metrics

Timeline

What happened to this CVE, newest first.

  • 2026
  • Fix documented
    Oct 27, 2026 · GitHub Security Advisories
  • Affected products added · maven/com.fasterxml.jackson.dataformat:jackson-dataformat-cbor
    Oct 27, 2026 · GitHub Security Advisories
  • Record published
    Oct 27, 2026
  • Fix documented
    Oct 27, 2026 · NIST National Vulnerability Database
  • Affected products added · fasterxml/jackson-dataformats-binary, quarkus/quarkus, oracle/weblogic server
    Oct 27, 2026 · NIST National Vulnerability Database
  • CVSS changed · 7.5
    Oct 27, 2026 · NIST National Vulnerability Database
  • Source status changed · → Modified
    Oct 27, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 27, 2026 · Alertas do Telegram
  • 2021
  • CVE published
    Feb 18, 2021 · snyk

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 27, 2026 – Oct 27, 2026
  • 1× Official description updated · Oct 27, 2026 – Oct 27, 2026

References

7 on the record

Elsewhere on this site

Fasterxml
every CVE for this vendor
Denial of service
same class
CWE-770
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-91502 Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core)... 9d
  • CVE-2026-91323 Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core)... 9d
  • CVE-2026-87302 Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core)... 9d
  • CVE-2026-83399 Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core)... 9d
  • CVE-2026-101515 Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component:... 9d
  • CVE-2026-68496 jackson-dataformats-binary: Smile parser does not enforce StreamReadConstraints.maxNameLength, enabling memory-exhaustion denial of service 28d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No CISA SSVC assessment.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2020-28491 is "Denial of Service (DoS)", rated High. It affects Jackson-dataformats-binary (Fasterxml); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.5 describes technical severity. EPSS 3.07% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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