CVE-2019-9895

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
84%
KEV
Not listed

Published

March 21, 2019

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Aug 16, 2026
No patch confirmed yet.
generic

[SECURITY] [DSA 4423-1] putty security update

https://www.debian.org/security/2019/dsa-4423
generic

PuTTY Change Log

https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20190404-0001/
generic

Bugtraq: [SECURITY] [DSA 4423-1] putty security update

https://seclists.org/bugtraq/2019/Apr/6
generic

[SECURITY] Fedora 29 Update: putty-0.71-1.fc29 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LDO3F267P347E6U2IILFCYW7JPTLCCES/
generic

[SECURITY] Fedora 28 Update: putty-0.71-1.fc28 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36LWQ3NPFIV7DC7TC4KFPRYRH2OR7SZ2/

Affected Packages

(19 across 19 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r1 (13 versions)0.71-r0—
Alpine:v3.11(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r1 (13 versions)0.71-r0—
Alpine:v3.12(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r1 (13 versions)0.71-r0—
Alpine:v3.13(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r1 (13 versions)0.71-r0—
Alpine:v3.14(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r1 (13 versions)0.71-r0—
Alpine:v3.15(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r1 (13 versions)0.71-r0—
Alpine:v3.16(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r1 (13 versions)0.71-r0—
Alpine:v3.17(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r1 (13 versions)0.71-r0—
Alpine:v3.18(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r1 (13 versions)0.71-r0—
Alpine:v3.19(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r1 (13 versions)0.71-r0—
Alpine:v3.6(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.69-r0 (11 versions)0.71-r0—
Alpine:v3.7(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r0 (12 versions)0.71-r0—
Alpine:v3.8(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r0 (12 versions)0.71-r0—
Alpine:v3.9(1)
PackageVulnerable rangeFixed inDependents
putty0.60-r0 ... 0.70-r1 (13 versions)0.71-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
putty—0.70-6—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
putty—0.70-6—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
putty—0.70-6—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
putty—0.70-6—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
putty0.67-30.67-3+deb9u1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 29× 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 127 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2019-9895?
CVE-2019-9895 is a critical vulnerability published on March 21, 2019. In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
When was CVE-2019-9895 disclosed?
CVE-2019-9895 was first published in the National Vulnerability Database on March 21, 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-2019-9895 actively exploited?
CVE-2019-9895 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 16.1% of all scored CVEs.
What is the CVSS score of CVE-2019-9895?
CVE-2019-9895 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-9895?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-9895, 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-2019-9895

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