Public proof of conceptFix available

CVE-2020-11998

A public proof of concept exists; no exploitation attested.

Published2020-09-10

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

A regression has been introduced in the commit preventing JMX re-bind. By passing an empty environment map to RMIConnectorServer, instead of the map that contains the authentication credentials, it leaves ActiveMQ open to the following attack: https://docs.oracle.com/javase/8/docs/technotes/guides/management/agent.html "A remote client could create a javax.management.loading.MLet MBean and use it to create new MBeans from arbitrary URLs, at least if there is no security manager. In other words, a rogue remote client could make your Java application execute arbitrary code." Mitigation: Upgrade to Apache ActiveMQ 5.15.13

Timeline

dates in UTC

2020-09-1019:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2020-11998?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-11998?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Oracle flexcube private banking

Branch	Affected	Fixed in	Source
12.0	= 12.0.0	no fix published	NVD
12.1	= 12.1.0	no fix published	NVD

Apache activemq

Branch	Affected	Fixed in	Source
5.15	= 5.15.12	no fix published	NVD

Oracle communications diameter signaling router

Branch	Affected	Fixed in	Source
8.x	≥ 8.0.0, ≤ 8.5.0	no fix published	NVD

6 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

Advisories and patches

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedshoucheng3/apache__activemq_CVE-2020-11998_5-15-12

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
FIRST EPSSEPSS score48.9 %read 2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23
OSVaffected packages—

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: 2020-09-10
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-11998?

Is CVE-2020-11998 actively exploited?

Active exploitation of CVE-2020-11998 has not been confirmed. Its EPSS score was 48.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-11998?

CVE-2020-11998 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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