CVE-2020-11077 — In Puma (RubyGem) before 4
In Puma (RubyGem) before 4.3.5 and 3.12.6, a client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mis
Published
2020-05-22T14:55:13.000Z
Last modified
2024-08-04T11:21:14.618Z
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
01What is this vulnerability?
In Puma (RubyGem) before 4.3.5 and 3.12.6, a client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second…
02Affected products
| Vendor | Product | Versions |
|---|
| puma | puma | < 3.12.6, >= 4.0.0, < 4.3.5 |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2020-05-22T14:55:13.000Z
- Last modified: 2024-08-04T11:21:14.618Z
09References
- github.com — https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05…
- github.com — https://github.com/puma/puma/security/advisories/GHSA-w64w-qqph-5gxm
- lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html
- lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html
- lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/10/msg00009.html
Want this in your SOAR or SIEM?
SARA's API returns EPSS, CVSS, KEV, and an analyst-grade summary in one call.
Read the API reference →