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CVE-2019-16779

20
FAUCET Score

CVE-2019-16779 describes a race condition in RubyGem excon versions prior to 0.71.0, affecting products like Debian and OpenSUSE. This vulnerability allows subsequent requests to receive data from a previous, interrupted connection due to residual data on the socket. Rated as MEDIUM severity (CVSS 5.9), it has a network attack vector and high confidentiality impact, but a high attack complexity due to the short race condition window. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or inclusion in the KEV catalog, with minimal community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.71.0CPE matchmatch criteria
cpe:2.3:a:excon_project:excon:*:*:*:*:*:*:*:*
15.0CPE matchmatch criteria
cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*
15.1CPE matchmatch criteria
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.8MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.3
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.40%
Probability of exploitation in next 30 days
EPSS Percentile
69.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0140 is in the 41st percentile among its peer group of 19,954 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
rubygemspatch availablevia ghsa
Product: exconFixed in: 0.71.0

Vendor Advisories (1)

rubygemsGHSA-q58g-455p-8vw9medium

In RubyGem excon, interrupted Persistent Connections May Leak Response Data

Dec 16, 2019

References

lists.opensuse.org / opensuse-security-announce/2020-01/msg00021.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2020-01/msg00062.html
Third Party Advisory
github.com / excon/excon/commit/ccb57d7a422f020dc74f1de4e8fb505ab46d8a29
PatchThird Party Advisory
github.com / excon/excon/security/advisories/GHSA-q58g-455p-8vw9
Third Party Advisory
lists.debian.org / debian-lts-announce/2020/01/msg00015.html
Mailing ListThird Party Advisory