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MEDIUM severity

CVE-2021-25640 — dubbo

MEDIUM

CVE-2021-25640 is a medium-severity (CVSS 6.1) Server-Side Request Forgery (SSRF) vulnerability in org.apache.dubbo:dubbo. A fix is available for org.apache.dubbo:dubbo — see the affected versions and patch details below.

Server-Side Request Forgery in Apache Dubbo

Also known asGHSA-gw4j-4229-q4px
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs82th percentile — riskier than 82% of all scored CVEsHighest risk
0.20%0.99%1.78%2.57%0.7%2.1%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.apache.dubbo:dubbo☕com.alibaba:dubbo

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 Apache Dubbo prior to 2.6.9 and 2.7.9, the usage of parseURL method will lead to the bypass of white host check which can cause open redirect or SSRF vulnerability.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.dubbo:dubbo≥ 2.5.0&&< 2.7.102.7.10org.apache.dubbo:dubbo:2.7.10
☕Mavencom.alibaba:dubbo≥ 2.5.0&&< 2.6.92.6.9com.alibaba:dubbo:2.6.9

Affected Products

1 product · 2 configurations
Application
dubboapache
≥ 2.7.0 && < 2.7.9
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.apache.dubbo:dubbo, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.dubbo:dubbo to 2.7.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-25640 is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Frequently Asked Questions

In Apache Dubbo prior to 2.6.9 and 2.7.9, the usage of parseURL method will lead to the bypass of white host check which can cause open redirect or SSRF vulnerability.
O3 Security · Impact-Aware SCA

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CVE-2021-25640: dubbo SSRF — Fixed in 2.7.10