CVE-2016-6903

CRITICALNVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-17. NVD baseline CVSS 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 5%CVSS: 9.9Exploit: NoneExposed: 0

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

lshell 0.9.16 allows remote authenticated users to break out of a limited shell and execute arbitrary commands.

CVSS v3
9.9
EG Score
9.9(medium)
EPSS
91.1%
KEV
Not listed

Published

April 24, 2017

Last Modified

May 13, 2026

Advisory Details (7)

Auto-updated Jul 5, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, redhat, github_commit.
generic
http://www.securityfocus.com/bid/92591
generic

oss-security - Re: CVE Request: lshell: shell outbreak vulnerabilities via bad syntax parse and multiline commands

http://www.openwall.com/lists/oss-security/2016/08/22/17
github_pr

[security] parse quoted strings for possible commands #147, #148, #149

Fix merged in ghantoos/lshell PR #153 on 2016-08-25 — awaiting tagged release

https://github.com/ghantoos/lshell/pull/153/commits/a686f71732a3d0f16df52ef46ab8a49ee0083c68
generic

SECURITY ISSUE: Escape possible using special keys · Issue #149 · ghantoos/lshell · GitHub

https://github.com/ghantoos/lshell/issues/149
github_commit

commit e72dfcd1f258 (ghantoos/lshell)

Fix landed in ghantoos/lshell commit e72dfcd1f258 — awaiting tagged release

https://github.com/ghantoos/lshell/commit/e72dfcd1f258193f9aaea3591ecbdaed207661a0
redhat

1369345 – (CVE-2016-6902, CVE-2016-6903) CVE-2016-6902 CVE-2016-6903 lshell: Shell outbreak vulnerabilities via bad syntax parse and multiline commands

https://bugzilla.redhat.com/show_bug.cgi?id=1369345
generic Patch Available

#834946 - lshell: CVE-2016-6903: Shell outbreak with multiline commands - Debian Bug report logs

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=834946

Data Freshness Timeline

(refreshed 8× in last 7d / 36× 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.

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

Frequently asked(5)

What is CVE-2016-6903?
CVE-2016-6903 is a critical vulnerability published on April 24, 2017. lshell 0.9.16 allows remote authenticated users to break out of a limited shell and execute arbitrary commands.
When was CVE-2016-6903 disclosed?
CVE-2016-6903 was first published in the National Vulnerability Database on April 24, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-6903 actively exploited?
CVE-2016-6903 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-6903?
CVE-2016-6903 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2016-6903?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-6903, 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.

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