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MEDIUM severity

CVE-2021-22097 — spring-amqp

MEDIUM

CVE-2021-22097 is a medium-severity (CVSS 6.5) Deserialization of Untrusted Data vulnerability in org.springframework.amqp:spring-amqp. A fix is available for org.springframework.amqp:spring-amqp — see the affected versions and patch details below.

Deserialization of Untrusted Data in Spring AMQP

Also known asGHSA-fx7f-rjqj-52pj
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs65th percentile — riskier than 65% of all scored CVEsHighest risk
0.00%0.52%1.05%1.57%0.4%1.1%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
☕org.springframework.amqp:spring-amqp☕org.springframework.amqp:spring-amqp

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

In Spring AMQP versions 2.2.0 - 2.2.18 and 2.3.0 - 2.3.10, the Spring AMQP Message object, in its toString() method, will deserialize a body for a message with content type application/x-java-serialized-object. It is possible to construct a malicious java.util.Dictionary object that can cause 100% CPU usage in the application if the toString() method is called.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.springframework.amqp:spring-amqp≥ 2.2.0&&< 2.2.192.2.19org.springframework.amqp:spring-amqp:2.2.19
☕Mavenorg.springframework.amqp:spring-amqp≥ 2.3.0&&< 2.3.112.3.11org.springframework.amqp:spring-amqp:2.3.11

Affected Products

1 product · 2 configurations
Application
spring advanced message queuing protocolvmware
≥ 2.3.0 && ≤ 2.3.10
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.springframework.amqp:spring-amqp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.springframework.amqp:spring-amqp to 2.2.19 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-22097 is resolved across your whole dependency graph.

  3. Workarounds

    Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

In Spring AMQP versions 2.2.0 - 2.2.18 and 2.3.0 - 2.3.10, the Spring AMQP Message object, in its toString() method, will deserialize a body for a message with content type application/x-java-serialized-object. It is possible to construct a malicious java.util.Dictionary object that can cause 100% CPU usage in the application if the toString() method is called.
O3 Security · Impact-Aware SCA

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CVE-2021-22097: spring-amqp — Fixed in 2.2.19