CVE-2019-16779

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 1.4% (72nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1.7%CVSS: 5.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
5.9
EG Score
5.9MEDIUMmedium confidence
EG Risk
32
EG Risk 32/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity59% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.7%
EPSS %ILE
75th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

December 16, 2019

Last Modified

July 28, 2026

Advisory Details (3)

Auto-updated Jul 28, 2026
Patch available. Sources: github_commit, github.
genericMentions a patch (unverified)

[SECURITY] [DLA 2070-1] ruby-excon security update

https://lists.debian.org/debian-lts-announce/2020/01/msg00015.html
githubMentions a patch (unverified)

Interrupted Persistent Connections May Leak Response Data · Advisory · excon/excon · GitHub

Affected: 0.71.0, users should upgrade to this or a newer version (if one exists).

https://github.com/excon/excon/security/advisories/GHSA-q58g-455p-8vw9
github_commit

commit ccb57d7a422f (excon/excon)

Fix landed in excon/excon commit ccb57d7a422f — awaiting tagged release

https://github.com/excon/excon/commit/ccb57d7a422f020dc74f1de4e8fb505ab46d8a29

Affected Packages

(6 across 6 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-excon—
  • every version up to 0.60.0-2: fixed in 0.60.0-2
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-excon—
  • every version up to 0.60.0-2: fixed in 0.60.0-2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-excon—
  • every version up to 0.60.0-2: fixed in 0.60.0-2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-excon—
  • every version up to 0.60.0-2: fixed in 0.60.0-2
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-excon0.33.0-2
  • every version up to 0.33.0-2+deb8u1: fixed in 0.33.0-2+deb8u1
—
RubyGems(1)
PackageVulnerable rangeFix by version rangeDependents
excon0.0.1 ... 0.9.6 (207 versions)
  • every version up to 0.71.0: fixed in 0.71.0
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 163 total refreshes for this CVE.

  1. 2026-10-09 20:03 UTCEPSS rescore
  2. 2026-10-08 16:37 UTCEPSS rescore
  3. 2026-10-07 23:43 UTCEPSS rescore
  4. 2026-10-07 17:05 UTCOSV refresh
  5. 2026-10-06 15:12 UTCEPSS rescore
  6. 2026-10-05 17:39 UTCEPSS rescore
  7. 2026-10-03 14:22 UTCEPSS rescore
  8. 2026-09-30 14:59 UTCEPSS rescore
  9. 2026-09-30 10:13 UTCEG score recompute
  10. 2026-09-28 13:46 UTCEPSS rescore
  11. 2026-09-27 13:40 UTCEPSS rescore
  12. 2026-09-26 15:54 UTCEPSS rescore
  13. 2026-09-26 15:54 UTCEPSS rescore
  14. 2026-09-26 00:20 UTCEPSS rescore
  15. 2026-09-24 13:59 UTCEPSS rescore
  16. 2026-09-23 13:43 UTCEPSS rescore
  17. 2026-09-22 14:43 UTCEPSS rescore
  18. 2026-09-21 20:28 UTCEPSS rescore
  19. 2026-09-18 19:22 UTCEPSS rescore
  20. 2026-09-17 23:06 UTCOSV refresh
  21. 2026-09-17 19:22 UTCEPSS rescore
  22. 2026-09-16 14:04 UTCEPSS rescore
  23. 2026-09-15 03:05 UTCEPSS rescore
  24. 2026-09-13 16:42 UTCEPSS rescore
  25. 2026-09-12 14:56 UTCEPSS rescore
Show 75 more
  1. 2026-09-11 14:48 UTCEPSS rescore
  2. 2026-09-11 09:32 UTCEPSS rescore
  3. 2026-09-07 15:57 UTCEPSS rescore
  4. 2026-09-06 13:44 UTCEPSS rescore
  5. 2026-09-05 15:24 UTCEPSS rescore
  6. 2026-09-04 13:56 UTCEPSS rescore
  7. 2026-09-02 14:07 UTCEPSS rescore
  8. 2026-09-01 03:32 UTCEPSS rescore
  9. 2026-08-30 19:13 UTCEPSS rescore
  10. 2026-08-30 01:18 UTCEPSS rescore
  11. 2026-08-29 23:43 UTCOSV refresh
  12. 2026-08-28 21:36 UTCEPSS rescore
  13. 2026-08-27 14:21 UTCEPSS rescore
  14. 2026-08-26 14:42 UTCEPSS rescore
  15. 2026-08-25 13:45 UTCEPSS rescore
  16. 2026-08-24 14:11 UTCEPSS rescore
  17. 2026-08-21 23:45 UTCEPSS rescore
  18. 2026-08-20 22:51 UTCEPSS rescore
  19. 2026-08-19 17:00 UTCEPSS rescore
  20. 2026-08-18 13:44 UTCEPSS rescore
  21. 2026-08-17 13:43 UTCEPSS rescore
  22. 2026-08-16 14:52 UTCEPSS rescore
  23. 2026-08-16 02:10 UTCEPSS rescore
  24. 2026-08-15 01:26 UTCEPSS rescore
  25. 2026-08-13 09:44 UTCOSV refresh
  26. 2026-08-12 13:47 UTCEPSS rescore
  27. 2026-08-09 13:43 UTCEPSS rescore
  28. 2026-08-08 16:33 UTCEPSS rescore
  29. 2026-08-07 16:23 UTCEPSS rescore
  30. 2026-08-06 13:43 UTCEPSS rescore
  31. 2026-08-05 19:13 UTCEPSS rescore
  32. 2026-08-04 15:05 UTCEPSS rescore
  33. 2026-08-02 02:23 UTCEPSS rescore
  34. 2026-08-01 04:12 UTCEPSS rescore
  35. 2026-07-30 16:24 UTCEPSS rescore
  36. 2026-07-30 01:27 UTCEPSS rescore
  37. 2026-07-28 18:17 UTCEG score recompute▲ 0.10
  38. 2026-07-28 18:17 UTCNVD updateCVSS v3 → 5.9
  39. 2026-07-28 15:32 UTCEPSS rescore
  40. 2026-07-26 14:51 UTCEPSS rescore
  41. 2026-07-25 14:14 UTCEPSS rescore
  42. 2026-07-24 14:14 UTCEPSS rescore
  43. 2026-07-24 14:14 UTCEPSS rescore
  44. 2026-07-23 14:15 UTCEPSS rescore
  45. 2026-07-23 01:41 UTCEG score recompute
  46. 2026-07-22 22:21 UTCEG score recompute
  47. 2026-07-22 14:05 UTCEPSS rescore
  48. 2026-07-21 15:22 UTCEPSS rescore
  49. 2026-07-21 15:22 UTCEPSS rescore
  50. 2026-07-20 17:04 UTCEPSS rescore
  51. 2026-07-20 17:04 UTCEPSS rescore
  52. 2026-07-20 00:08 UTCOSV refresh
  53. 2026-07-19 14:28 UTCEPSS rescore
  54. 2026-07-19 14:28 UTCEPSS rescore
  55. 2026-07-19 02:26 UTCEPSS rescore
  56. 2026-07-19 02:26 UTCEPSS rescore
  57. 2026-07-18 10:01 UTCEPSS rescore
  58. 2026-07-16 16:59 UTCEPSS rescore
  59. 2026-07-16 16:59 UTCEPSS rescore
  60. 2026-07-15 16:55 UTCEPSS rescore
  61. 2026-07-15 16:55 UTCEPSS rescore
  62. 2026-07-13 22:27 UTCEPSS rescore
  63. 2026-07-13 06:10 UTCEPSS rescore
  64. 2026-07-13 06:10 UTCEPSS rescore
  65. 2026-07-12 05:43 UTCEPSS rescore
  66. 2026-07-12 05:43 UTCEPSS rescore
  67. 2026-07-11 08:24 UTCEPSS rescore
  68. 2026-07-11 08:24 UTCEPSS rescore
  69. 2026-07-09 19:06 UTCEPSS rescore
  70. 2026-07-08 15:11 UTCEPSS rescore
  71. 2026-07-06 16:25 UTCEPSS rescore
  72. 2026-07-06 16:25 UTCEPSS rescore
  73. 2026-07-06 02:20 UTCEPSS rescore
  74. 2026-07-05 02:27 UTCEPSS rescore
  75. 2026-07-04 06:28 UTCEPSS rescore

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Debian:11:ruby-excon

Frequently asked(5)

What is CVE-2019-16779?
CVE-2019-16779 is a medium vulnerability published on December 16, 2019. 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…
When was CVE-2019-16779 disclosed?
CVE-2019-16779 was first published on December 16, 2019, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-16779 actively exploited?
CVE-2019-16779 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.7% probability of exploitation in the next 30 days (75th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2019-16779?
CVE-2019-16779 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2019-16779?
A fix for CVE-2019-16779 is available: update to the fixed version the vendor names in its advisory.

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