The Bzip2 decompression decoder function doesn't allow setting size restrictions on the decompressed output data (which affects the allocation size used during decompression). All users of Bzip2Decoder are affected. The malicious input can trigger an OOME and so a DoS attack
CVE-2021-37136
HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 1.2%, top 21% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 6%CVSS: 7.5Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EPSS
- 92.0%
- KEV
- Not listed
Published
October 19, 2021
Last Modified
November 21, 2024
References (26)
- reefs@jfroghttps://github.com/netty/netty/security/advisories/GHSA-grg4-wf29-r9vv
- reefs@jfroghttps://lists.apache.org/thread.html/r06a145c9bd41a7344da242cef07977b24abe3349161ede948e30913d%40%3Ccommits.druid.apache.org%3E
- reefs@jfroghttps://lists.apache.org/thread.html/r5406eaf3b07577d233b9f07cfc8f26e28369e6bab5edfcab41f28abb%40%3Ccommits.druid.apache.org%3E
- reefs@jfroghttps://lists.apache.org/thread.html/r5e05eba32476c580412f9fbdfc9b8782d5b40558018ac4ac07192a04%40%3Ccommits.druid.apache.org%3E
- reefs@jfroghttps://lists.apache.org/thread.html/r75490c61c2cb7b6ae2c81238fd52ae13636c60435abcd732d41531a0%40%3Ccommits.druid.apache.org%3E
- reefs@jfroghttps://lists.apache.org/thread.html/rd262f59b1586a108e320e5c966feeafbb1b8cdc96965debc7cc10b16%40%3Ccommits.druid.apache.org%3E
- reefs@jfroghttps://lists.apache.org/thread.html/rfb2bf8597e53364ccab212fbcbb2a4e9f0a9e1429b1dc08023c6868e%40%3Cdev.tinkerpop.apache.org%3E
- reefs@jfroghttps://lists.debian.org/debian-lts-announce/2023/01/msg00008.html
- reefs@jfroghttps://security.netapp.com/advisory/ntap-20220210-0012/
- reefs@jfroghttps://www.debian.org/security/2023/dsa-5316
- reefs@jfroghttps://www.oracle.com/security-alerts/cpuapr2022.html
- reefs@jfroghttps://www.oracle.com/security-alerts/cpujan2022.html
- reefs@jfroghttps://www.oracle.com/security-alerts/cpujul2022.html
- af854a3a-2127-422b-91ae-364da2661108https://github.com/netty/netty/security/advisories/GHSA-grg4-wf29-r9vv
- af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r06a145c9bd41a7344da242cef07977b24abe3349161ede948e30913d%40%3Ccommits.druid.apache.org%3E
Vendor Advisories for CVE-2021-37136(14)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2025:9582Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.1.11 on RHEL 7 security update
- RHSA-2025:9583Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.3.14 Security update
- RHSA-2023:5165Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat AMQ Streams 2.5.0 release and security update
- RHSA-2022:6835Red Hat Product SecurityHigh
Red Hat Security Advisory: Service Registry (container images) release and security update [2.3.0.GA]
- RHSA-2022:4919Red Hat Product SecurityMedium
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.5 security update on RHEL 8
- RHSA-2022:4918Red Hat Product SecurityMedium
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.5 security update on RHEL 7
- RHSA-2022:4922Red Hat Product SecurityMedium
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.5 security update
- RHSA-2022:2217Red Hat Product SecurityMedium
Red Hat Security Advisory: Red Hat OpenShift Logging Security and Bug update Release 5.3.7
- +6 more
Patch Availability(17)
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(3 across 1 ecosystem)
Maven(3)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| io.netty:netty | 3.10.0.Final ... 4.0.0.Alpha8 (71 versions) | — | — |
| io.netty:netty-codec | 4.0.0.Alpha1 ... 4.1.9.Final (161 versions) | 4.1.68.Final | — |
| org.jboss.netty:netty | 3.0.0.CR1 ... 3.2.9.Final (39 versions) | — | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(10)
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
- Red HatRHSA-2021:3959MODERATE2021-09-09
RHSA-2021:3959 — Moderate
- Red HatRHSA-2021:4851MODERATE2021-09-09
RHSA-2021:4851 — Moderate
- Red HatRHSA-2022:0138MODERATE2021-09-09
RHSA-2022:0138 — Moderate
- Red HatRHSA-2022:0520MODERATE2021-09-09
RHSA-2022:0520 — Moderate
- Red HatRHSA-2022:0589MODERATE2021-09-09
RHSA-2022:0589 — Moderate
- Red HatRHSA-2022:1013MODERATE2021-09-09
RHSA-2022:1013 — Moderate
- Red HatRHSA-2022:5903MODERATE2021-09-09
RHSA-2022:5903 — Moderate
- Red HatRHSA-2022:8506MODERATE2021-09-09
RHSA-2022:8506 — Moderate
- Red HatRHSA-2023:3223MODERATE2021-09-09
RHSA-2023:3223 — Moderate
- UbuntuUSN-6049-1MEDIUM
Netty vulnerabilities
Frequently asked(5)
What is CVE-2021-37136?
CVE-2021-37136 is a high vulnerability published on October 19, 2021. The Bzip2 decompression decoder function doesn't allow setting size restrictions on the decompressed output data (which affects the allocation size used during decompression). All users of Bzip2Decoder are affected. The malicious input can trigger an OOME and so a DoS attack
When was CVE-2021-37136 disclosed?
CVE-2021-37136 was first published in the National Vulnerability Database on October 19, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-37136 actively exploited?
CVE-2021-37136 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-37136?
CVE-2021-37136 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2021-37136?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-37136, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-37136
Is Your Infrastructure Affected by CVE-2021-37136?
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