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Public proof of conceptFix available

CVE-2020-8840

A public proof of concept exists; no exploitation attested.

  • Published2020-02-10
  • WeaknessCWE-502

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

FasterXML jackson-databind 2.0.0 through 2.9.10.2 lacks certain xbean-reflect/JNDI blocking, as demonstrated by org.apache.xbean.propertyeditor.JndiConverter.

Timeline

dates in UTC
  1. 2020-02-1021:56CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub
  3. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

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-2020-8840?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-8840?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Huawei oceanstor 9000 firmwareversion to verify
BranchAffectedFixed in
300.x= v300r006c20no fix published
300.x= v300r006c20spc100no fix published
300.x= v300r006c20spc200no fix published
300.x= v300r006c20spc300no fix published
Fasterxml jackson-databind
BranchAffectedFixed in
2.9≥ 2.9.0, < 2.9.10.32.9.10.3
2.8≥ 2.8.0, < 2.8.11.52.8.11.5
2.x≥ 2.0.0, < 2.7.9.72.7.9.7
Oracle global lifecycle management opatch
BranchAffectedFixed in
13.9≥ 13.9.4.0.0, < 13.9.4.2.113.9.4.2.1
12.2≥ 12.2.0.1.0, < 12.2.0.1.1912.2.0.1.19
11.2< 11.2.0.3.2311.2.0.3.23

5 more products in the sources.

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

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-10-23 19:23 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
6 repositories, unverifiedjas502n/jackson-CVE-2020-8840Wfzsec/FastJson1.2.62-RCEfairyming/CVE-2020-8840Blyth0He/CVE-2020-8840Veraxy00/CVE-2020-8840
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2026-10-08
  • OpenCVESSVC decisionnone—
  • NVDCVSS 3.19.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • NVDweakness (CWE)CWE-502read 2026-10-23
  • FIRST EPSSEPSS score26.6 %read 2026-10-23
  • PoC-in-GitHubproof of concept6read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2020-02-10
Last Modified
2026-10-08
NVD status
Modified

Frequently asked questions

What is CVE-2020-8840?

FasterXML jackson-databind 2.0.0 through 2.9.10.2 lacks certain xbean-reflect/JNDI blocking, as demonstrated by org.apache.xbean.propertyeditor.JndiConverter.

Is CVE-2020-8840 actively exploited?

Active exploitation of CVE-2020-8840 has not been confirmed. Its EPSS score was 26.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-8840?

CVE-2020-8840 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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