HOMEVULNERABILITIESCVE-2019-16770
HIGH

CVE-2019-16770

CWE-770Published: December 5, 2019· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

In Puma before versions 3.12.2 and 4.3.1, a poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack. If more keepalive connections to Puma are opened than there are threads available, additional connections will wait permanently if the attacker sends requests frequently enough. This vulnerability is patched in Puma 4.3.1 and 3.12.2.

NVD Source

Technical Analysis

CVE-2019-16770 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
puma1 product(s)
puma
Source: NVD CPE · 2 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

ADVISORYhttps://github.com/puma/puma/security/advisories/GHSA-7xx3-m584-x994
ADVISORYhttps://lists.debian.org/debian-lts-announce/2022/05/msg00034.html
ADVISORYhttps://github.com/puma/puma/security/advisories/GHSA-7xx3-m584-x994
ADVISORYhttps://lists.debian.org/debian-lts-announce/2022/05/msg00034.html

All References (4)

→
https://github.com/puma/puma/security/advisories/GHSA-7xx3-m584-x994Mitigation · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2022/05/msg00034.htmlMailing List · Third Party Advisory
→
https://github.com/puma/puma/security/advisories/GHSA-7xx3-m584-x994Mitigation · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2022/05/msg00034.htmlMailing List · Third Party Advisory

Quick Facts

CVE IDCVE-2019-16770
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-770
CISA KEVNo
Affected2 vendor(s)
PublishedDec 5, 2019

Related CVEs (CWE-770)

CVE-2023-25156
9.8
CVE-2018-20033
9.8
CVE-2023-38507
9.8
CVE-2022-3439
9.8
CVE-2022-3456
9.8
CVE-2022-3273
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-16770 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.COM. CVE data is provided under the NVD usage policy.
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