CVE-2017-12340

MEDIUMNVD 4.24.2—
EchelonGraph scoreMEDIUM confidence

Score 4.2 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 4.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
4.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.2Exploit: None knownExposed: 0

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

A vulnerability in Cisco NX-OS System Software running on Cisco MDS Multilayer Director Switches, Cisco Nexus 7000 Series Switches, and Cisco Nexus 7700 Series Switches could allow an authenticated, local attacker to access the Bash shell of an affected device's operating system, even if the Bash shell is disabled on the system. The vulnerability is due to insufficient sanitization of user-supplied parameters that are passed to certain functions of the Python scripting sandbox of the affected system. An attacker could exploit this vulnerability to escape the scripting sandbox and enter the Bash shell of the operating system with the privileges of the authenticated user for the affected system. To exploit this vulnerability, the attacker must have local access to the affected system and be authenticated to the affected system with administrative or Python execution privileges. Cisco Bug IDs: CSCvd86513.

CVSS v3
4.2
EG Score
4.2(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity42% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

November 30, 2017

Last Modified

June 17, 2026

References (4)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 6× 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. 2026-07-26 14:51 UTCEPSS rescore
  2. 2026-07-25 14:13 UTCEPSS rescore
  3. 2026-07-23 14:15 UTCEPSS rescore
  4. 2026-07-23 01:26 UTCEG score recompute
  5. 2026-07-22 22:05 UTCEG score recompute
  6. 2026-07-22 14:04 UTCEPSS rescore
  7. 2026-07-20 17:04 UTCEPSS rescore
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  19. 2026-07-13 22:26 UTCEPSS rescore
  20. 2026-07-13 06:09 UTCEPSS rescore
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  1. 2026-07-06 16:24 UTCEPSS rescore
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  5. 2026-07-01 15:02 UTCEPSS rescore
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  7. 2026-06-30 23:19 UTCEPSS rescore
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  13. 2026-06-25 13:47 UTCEPSS rescore
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  19. 2026-06-21 14:54 UTCEPSS rescore
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  23. 2026-06-19 19:23 UTCEPSS rescore
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  25. 2026-06-18 17:50 UTCEPSS rescore
  26. 2026-06-17 17:50 UTCEPSS rescore
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  31. 2026-06-13 22:57 UTCEPSS rescore
  32. 2026-06-12 23:09 UTCEPSS rescore
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  36. 2026-06-07 15:22 UTCEPSS rescore
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  40. 2026-06-05 22:44 UTCEPSS rescore
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  43. 2026-06-04 13:10 UTCEPSS rescore
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  45. 2026-06-02 20:11 UTCEPSS rescore
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  47. 2026-06-01 13:49 UTCEPSS rescore
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  49. 2026-05-31 22:28 UTCEPSS rescore
  50. 2026-05-31 00:14 UTCEPSS rescore
  51. 2026-05-29 13:41 UTCEPSS rescore
  52. 2026-05-28 13:42 UTCEPSS rescore
  53. 2026-05-28 13:42 UTCEPSS rescore
  54. 2026-05-27 13:38 UTCEPSS rescore
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  56. 2026-05-26 13:42 UTCEPSS rescore
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  58. 2026-05-26 07:17 UTCEPSS rescore
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  60. 2026-05-22 21:15 UTCEPSS rescore
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  62. 2026-05-22 21:15 UTCEPSS rescore
  63. 2026-05-22 07:37 UTCEG score recompute
  64. 2026-05-22 07:37 UTCGHSA enrichment
  65. 2026-05-20 11:21 UTCEPSS rescore
  66. 2026-05-20 11:21 UTCEPSS rescore
  67. 2026-05-18 21:30 UTCEPSS rescore
  68. 2026-05-18 21:30 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2017-12340?
CVE-2017-12340 is a medium vulnerability published on November 30, 2017. A vulnerability in Cisco NX-OS System Software running on Cisco MDS Multilayer Director Switches, Cisco Nexus 7000 Series Switches, and Cisco Nexus 7700 Series Switches could allow an authenticated, local attacker to access the Bash shell of an affected device's operating system, even if the Bash…
When was CVE-2017-12340 disclosed?
CVE-2017-12340 was first published in the National Vulnerability Database on November 30, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-12340 actively exploited?
CVE-2017-12340 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 73.7% of all scored CVEs.
What is the CVSS score of CVE-2017-12340?
CVE-2017-12340 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2017-12340?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-12340, 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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