CVE-2019-16779
MEDIUMEPSS 71th pctlDescription
In RubyGem excon before 0.71.0, there was a race condition around persistent connections, where a connection which is interrupted (such as by a timeout) would leave data on the socket. Subsequent requests would then read this data, returning content from the previous response. The race condition window appears to be short, and it would be difficult to purposefully exploit this.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N
Exploit Intelligence
Elevated risk: more likely to be exploited than 71% of all known CVEs.
References
Related Vulnerabilities
Other CWE-664 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-27518 | Critical | 9.8 | 6.9% | KEV | Fix |
| CVE-2022-2048 | High | 7.5 | 2.3% | - | Fix |
| CVE-2022-2191 | High | 7.5 | 2.1% | - | - |
| CVE-2020-3175 | High | 8.6 | 2.0% | - | - |
| CVE-2019-5816 | High | 8.8 | 1.6% | - | Fix |
| CVE-2024-45383 | Medium | 5.0 | 1.5% | - | - |
Common questions
How do I fix CVE-2019-16779?
Upgrade ruby-excon on debian 11 to 0.60.0-2 or later.
Is CVE-2019-16779 being actively exploited?
Not that we know of. CVE-2019-16779 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.4% is the estimated probability that it will be exploited in the next 30 days. That is higher than 71% of all scored CVEs.
How severe is CVE-2019-16779?
CVE-2019-16779 has a CVSS v3 base score of 5.8, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2019-16779 affect?
Published advisories record a fix for ruby-excon (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-28.