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Fencer Intel
critical 9.8

CVE-2020-27221 json

In Eclipse OpenJ9 up to and including version 0.23, there is potential for a stack-based buffer overflow when the virtual machine or JNI na…

published 5y ago modified 4mo ago also EUVD-2020-19736

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

In Eclipse OpenJ9 up to and including version 0.23, there is potential for a stack-based buffer overflow when the virtual machine or JNI natives are converting from UTF-8 characters to platform encoding.

Patch / fix

  • java-1.7.1-ibm RHEL 7 EXTRAS 1:1.7.1.4.80-1jpp.1.el7
  • java-1.7.1-ibm-src RHEL 7 EXTRAS 1:1.7.1.4.80-1jpp.1.el7
  • java-1.7.1-ibm-demo RHEL 7 EXTRAS 1:1.7.1.4.80-1jpp.1.el7
  • java-1.7.1-ibm-jdbc RHEL 7 EXTRAS 1:1.7.1.4.80-1jpp.1.el7
  • java-1.7.1-ibm-plugin RHEL 7 EXTRAS 1:1.7.1.4.80-1jpp.1.el7
  • java-1.8.0-ibm RHEL 8 1:1.8.0.6.25-2.el8_3
  • java-1.8.0-ibm-src RHEL 8 1:1.8.0.6.25-2.el8_3
  • java-1.8.0-ibm-demo RHEL 8 1:1.8.0.6.25-2.el8_3

red hat advisories RHSA-2021:0733RHSA-2021:0736RHSA-2021:0717

  • java-1_8_0-ibm SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 1.8.0_sr6.25-3.50.1
  • java-1_8_0-ibm SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +14 more 1.8.0_sr6.25-30.81.1
  • java-1_7_0-ibm SLE Point of Sale 11 SP3 1.7.0_sr10.80-65.60.1
  • java-1_7_1-ibm SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +14 more 1.7.1_sr4.80-38.62.1
  • java-1_7_1-ibm SLES 11 SP4-LTSS 1.7.1_sr4.80-26.65.1

suse advisories SUSE-SU-2021:0670-1SUSE-SU-2021:0652-1SUSE-SU-2021:14640-1SUSE-SU-2021:14634-1SUSE-SU-2021:0512-1

Is CVE-2020-27221 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-27221 updated cvss 9.8

JDK: Stack-based buffer overflow when converting from UTF-8 characters to platform encoding

  • Red Hat Enterprise Linux 8 Supplementary java-1.8.0-ibm 1.8.0.6.25-2.el8_3, java-1.8.0-ibm-src 1.8.0.6.25-2.el8_3, java-1.8.0-ibm-demo 1.8.0.6.25-2.el8_3, java-1.8.0-ibm-jdbc 1.8.0.6.25-2.el8_3, java-1.8.0-ibm-plugin 1.8.0.6.25-2.el8_3, java-1.8.0-ibm-headless 1.8.0.6.25-2.el8_3, +1 more
    fixed: vendor fix RHSA-2021:0736
  • Red Hat Enterprise Linux Client Supplementary (v. 7) java-1.7.1-ibm 1.7.1.4.80-1jpp.1.el7, java-1.8.0-ibm 1.8.0.6.25-1jpp.1.el7, java-1.7.1-ibm-src 1.7.1.4.80-1jpp.1.el7, java-1.8.0-ibm-src 1.8.0.6.25-1jpp.1.el7, java-1.7.1-ibm-demo 1.7.1.4.80-1jpp.1.el7, java-1.7.1-ibm-jdbc 1.7.1.4.80-1jpp.1.el7, +4 more Red Hat Enterprise Linux ComputeNode Supplementary (v. 7) java-1.7.1-ibm 1.7.1.4.80-1jpp.1.el7, java-1.8.0-ibm 1.8.0.6.25-1jpp.1.el7, java-1.7.1-ibm-src 1.7.1.4.80-1jpp.1.el7, java-1.8.0-ibm-src 1.8.0.6.25-1jpp.1.el7, java-1.7.1-ibm-demo 1.7.1.4.80-1jpp.1.el7, java-1.8.0-ibm-demo 1.8.0.6.25-1jpp.1.el7 Red Hat Enterprise Linux Server Supplementary (v. 7) java-1.7.1-ibm 1.7.1.4.80-1jpp.1.el7, java-1.8.0-ibm 1.8.0.6.25-1jpp.1.el7, java-1.7.1-ibm-src 1.7.1.4.80-1jpp.1.el7, java-1.8.0-ibm-src 1.8.0.6.25-1jpp.1.el7, java-1.7.1-ibm-demo 1.7.1.4.80-1jpp.1.el7, java-1.7.1-ibm-jdbc 1.7.1.4.80-1jpp.1.el7, +4 more Red Hat Enterprise Linux Workstation Supplementary (v. 7) java-1.7.1-ibm 1.7.1.4.80-1jpp.1.el7, java-1.8.0-ibm 1.8.0.6.25-1jpp.1.el7, java-1.7.1-ibm-src 1.7.1.4.80-1jpp.1.el7, java-1.8.0-ibm-src 1.8.0.6.25-1jpp.1.el7, java-1.7.1-ibm-demo 1.7.1.4.80-1jpp.1.el7, java-1.7.1-ibm-jdbc 1.7.1.4.80-1jpp.1.el7, +4 more
    fixed: vendor fix RHSA-2021:0733

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.55% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • The Eclipse Foundation Eclipse OpenJ9

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.