CVE-2019-3857

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 6%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: Track

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
Severity88% × 45%
Exploitation6% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
6%
EPSS %ILE
93%
KEV
Not listed

Published

March 25, 2019

Last Modified

November 21, 2024

Advisory Details (8)

Auto-updated Aug 24, 2026
Patch available. Sources: redhat.
generic Patch Available

[SECURITY] [DLA 1730-1] libssh2 security update

https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html
redhat Patch Available

1687305 – (CVE-2019-3857) CVE-2019-3857 libssh2: Integer overflow in SSH packet processing channel resulting in out of bounds write

Affected: Red Hat Enterprise Linux 7

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3857
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.3 Advanced Update Support, Red Hat Enterprise Linux 7.3 Telco Extended Update Support, and Red Hat

https://access.redhat.com/errata/RHSA-2019:2399
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2019:1943
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.5 Extended Update Support.

https://access.redhat.com/errata/RHSA-2019:1791
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2019:1652
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2019:1175
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2019:0679

Vendor Advisories for CVE-2019-3857(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibssh2-1 (1.5.0-2ubuntu0.1+esm1) @ xenial2026-05-27ubuntu
redhatlibssh2-0:1.4.3-11.el7_3.12019-08-07redhat
redhatlibssh2-0:1.4.3-11.el7_4.12019-07-30redhat
redhatlibssh2-0:1.4.3-11.el7_5.12019-07-16redhat
redhatlibssh2-0:1.4.2-3.el6_10.12019-07-02redhat
redhatvirt:rhel-8000020190510171727.55190bc52019-05-14redhat
redhatlibssh2-0:1.4.3-12.el7_6.22019-03-28redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(22 across 22 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.11(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.12(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.13(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.14(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.15(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.16(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.17(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.18(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.19(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Alpine:v3.9(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.1-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.0-2.1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.0-2.1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.0-2.1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libssh2—1.8.0-2.1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
libssh21.4.3-4.1, 1.4.3-4.1+deb8u11.4.3-4.1+deb8u2—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
libssh21.7.0-11.7.0-1+deb9u1—

Weakness Classification(2)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 18× 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 135 total refreshes for this CVE.

  1. 2026-09-08 15:34 UTCOSV refresh
  2. 2026-09-07 15:57 UTCEPSS rescore
  3. 2026-09-06 13:44 UTCEPSS rescore
  4. 2026-09-05 15:24 UTCEPSS rescore
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  11. 2026-08-25 13:45 UTCEPSS rescore
  12. 2026-08-22 01:41 UTCOSV refresh
  13. 2026-08-19 17:00 UTCEPSS rescore
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  20. 2026-08-08 16:33 UTCEPSS rescore
  21. 2026-08-07 16:23 UTCEPSS rescore
  22. 2026-08-06 05:54 UTCOSV refresh
  23. 2026-08-05 19:13 UTCEPSS rescore
  24. 2026-08-04 15:05 UTCEPSS rescore
  25. 2026-08-04 10:34 UTCEPSS rescore
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  1. 2026-08-03 10:32 UTCEPSS rescore
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  6. 2026-07-28 15:32 UTCEPSS rescore
  7. 2026-07-26 14:51 UTCEPSS rescore
  8. 2026-07-25 14:14 UTCEPSS rescore
  9. 2026-07-24 14:14 UTCEPSS rescore
  10. 2026-07-23 14:15 UTCEPSS rescore
  11. 2026-07-23 01:45 UTCEG score recompute
  12. 2026-07-22 22:26 UTCEG score recompute
  13. 2026-07-22 14:05 UTCEPSS rescore
  14. 2026-07-21 15:22 UTCEPSS rescore
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  16. 2026-07-20 20:02 UTCOSV refresh
  17. 2026-07-20 17:04 UTCEPSS rescore
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  20. 2026-07-19 02:26 UTCEPSS rescore
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  22. 2026-07-18 10:02 UTCEPSS rescore
  23. 2026-07-16 16:59 UTCEPSS rescore
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  25. 2026-07-15 16:55 UTCEPSS rescore
  26. 2026-07-15 01:57 UTCEPSS rescore
  27. 2026-07-13 22:27 UTCEPSS rescore
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  35. 2026-07-09 19:06 UTCEPSS rescore
  36. 2026-07-08 15:11 UTCEPSS rescore
  37. 2026-07-07 13:43 UTCEPSS rescore
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  42. 2026-07-05 02:27 UTCEPSS rescore
  43. 2026-07-04 06:28 UTCEPSS rescore
  44. 2026-07-03 15:26 UTCOSV refresh
  45. 2026-07-01 15:03 UTCEPSS rescore
  46. 2026-07-01 15:03 UTCEPSS rescore
  47. 2026-06-30 23:20 UTCEPSS rescore
  48. 2026-06-29 14:03 UTCEPSS rescore
  49. 2026-06-28 04:54 UTCEPSS rescore
  50. 2026-06-28 04:54 UTCEPSS rescore
  51. 2026-06-27 03:06 UTCEPSS rescore
  52. 2026-06-25 13:47 UTCEPSS rescore
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  68. 2026-06-17 17:50 UTCEPSS rescore
  69. 2026-06-16 17:50 UTCEPSS rescore
  70. 2026-06-15 17:46 UTCEPSS rescore
  71. 2026-06-15 04:43 UTCOSV refresh
  72. 2026-06-14 23:15 UTCEPSS rescore
  73. 2026-06-14 23:15 UTCEPSS rescore
  74. 2026-06-13 22:58 UTCEPSS rescore
  75. 2026-06-12 23:09 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2019-3857?
CVE-2019-3857 is a high vulnerability published on March 25, 2019. An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSHMSGCHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to…
When was CVE-2019-3857 disclosed?
CVE-2019-3857 was first published in the National Vulnerability Database on March 25, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-3857 actively exploited?
CVE-2019-3857 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 7.0% of all scored CVEs.
What is the CVSS score of CVE-2019-3857?
CVE-2019-3857 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2019-3857?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-3857, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-3857

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