HOMEVULNERABILITIESCVE-2020-11612
HIGH

CVE-2020-11612

CWE-770Published: April 7, 2020· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder.

NVD Source

Technical Analysis

CVE-2020-11612 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
netapp3 product(s)
oncommand api servicesoncommand insightoncommand workflow automation
netty1 product(s)
netty
Oracle7 product(s)
communications brm - elastic charging enginecommunications cloud native core service communication proxycommunications design studionosql databasesiebel core - server frameworkwebcenter portalcommunications messaging server
Source: NVD CPE · 15 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/netty/netty/compare/netty-4.1.45.Final...netty-4.1.46.Final
PATCHhttps://github.com/netty/netty/pull/9924
PATCHhttps://www.oracle.com//security-alerts/cpujul2021.html
PATCHhttps://www.oracle.com/security-alerts/cpuApr2021.html
PATCHhttps://www.oracle.com/security-alerts/cpujan2021.html
PATCHhttps://github.com/netty/netty/compare/netty-4.1.45.Final...netty-4.1.46.Final
PATCHhttps://github.com/netty/netty/pull/9924
PATCHhttps://www.oracle.com//security-alerts/cpujul2021.html
PATCHhttps://www.oracle.com/security-alerts/cpuApr2021.html
PATCHhttps://www.oracle.com/security-alerts/cpujan2021.html
ADVISORYhttps://github.com/netty/netty/issues/6168
ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/09/msg00003.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20201223-0001/
ADVISORYhttps://www.debian.org/security/2021/dsa-4885
ADVISORYhttps://www.oracle.com/security-alerts/cpuapr2022.html
ADVISORYhttps://github.com/netty/netty/issues/6168
ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/09/msg00003.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20201223-0001/
ADVISORYhttps://www.debian.org/security/2021/dsa-4885
ADVISORYhttps://www.oracle.com/security-alerts/cpuapr2022.html

All References (90)

→
https://github.com/netty/netty/compare/netty-4.1.45.Final...netty-4.1.46.FinalPatch · Third Party Advisory
→
https://github.com/netty/netty/issues/6168Third Party Advisory
→
https://github.com/netty/netty/pull/9924Patch · Third Party Advisory
→
https://lists.apache.org/thread.html/r14446ed58208cb6d97b6faa6ebf145f1cf2c70c0886c0c133f4d3b6f%40%3Ccommits.druid.apache.org%3E
→
https://lists.apache.org/thread.html/r255ed239e65d0596812362adc474bee96caf7ba042c7ad2f3c62cec7%40%3Cissues.zookeeper.apache.org%3E
→
https://lists.apache.org/thread.html/r281882fdf9ea89aac02fd2f92786693a956aac2ce9840cce87c7df6b%40%3Ccommits.zookeeper.apache.org%3E
→
https://lists.apache.org/thread.html/r2958e4d49ee046e1e561e44fdc114a0d2285927501880f15852a9b53%40%3Ccommits.druid.apache.org%3E
→
https://lists.apache.org/thread.html/r31424427cc6d7db46beac481bdeed9a823fc20bb1b9deede38557f71%40%3Cnotifications.zookeeper.apache.org%3E
→
https://lists.apache.org/thread.html/r3195127e46c87a680b5d1d3733470f83b886bfd3b890c50df718bed1%40%3Ccommits.druid.apache.org%3E
→
https://lists.apache.org/thread.html/r3ea4918d20d0c1fa26cac74cc7cda001d8990bc43473d062867ef70d%40%3Cnotifications.zookeeper.apache.org%3E
→
https://lists.apache.org/thread.html/r4a7e4e23bd84ac24abf30ab5d5edf989c02b555e1eca6a2f28636692%40%3Cnotifications.zookeeper.apache.org%3E
→
https://lists.apache.org/thread.html/r4f4a14d6a608db447b725ec2e96c26ac9664d83cd879aa21e2cfeb24%40%3Cnotifications.zookeeper.apache.org%3E
→
https://lists.apache.org/thread.html/r5030cd8ea5df1e64cf6a7b633eff145992fbca03e8bfc687cd2427ab%40%3Cnotifications.zookeeper.apache.org%3E
→
https://lists.apache.org/thread.html/r5a0b1f0b1c3bcd66f5177fbd6f6de2d0f8cae24a13ab2669f274251a%40%3Cnotifications.zookeeper.apache.org%3E
→
https://lists.apache.org/thread.html/r5b1ad61552591b747cd31b3a908d5ff2e8f2a8a6847583dd6b7b1ee7%40%3Cissues.zookeeper.apache.org%3E

Quick Facts

CVE IDCVE-2020-11612
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-770
CISA KEVNo
Affected5 vendor(s)
PublishedApr 7, 2020

Related CVEs (CWE-770)

CVE-2025-11832
9.8
CVE-2018-20033
9.8
CVE-2022-3439
9.8
CVE-2023-25156
9.8
CVE-2022-3456
9.8
CVE-2019-17067
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-11612 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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