CVE-2017-3823

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-17. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
8.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Metasploit, epss top5pct, public exploit)
CISA-KEV: Not listedEPSS PROB: 27%CVSS: 8.8Exploit: Metasploit · epss top5pct · public exploitExposed: 0

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

An issue was discovered in the Cisco WebEx Extension before 1.0.7 on Google Chrome, the ActiveTouch General Plugin Container before 106 on Mozilla Firefox, the GpcContainer Class ActiveX control plugin before 10031.6.2017.0126 on Internet Explorer, and the Download Manager ActiveX control plugin before 2.1.0.10 on Internet Explorer. A vulnerability in these Cisco WebEx browser extensions could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the affected browser on an affected system. This vulnerability affects the browser extensions for Cisco WebEx Meetings Server and Cisco WebEx Centers (Meeting Center, Event Center, Training Center, and Support Center) when they are running on Microsoft Windows. The vulnerability is a design defect in an application programing interface (API) response parser within the extension. An attacker that can convince an affected user to visit an attacker-controlled web page or follow an attacker-supplied link with an affected browser could exploit the vulnerability. If successful, the attacker could execute arbitrary code with the privileges of the affected browser.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
70(Track)
EG Risk 70/100SSVC: 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%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
27%
EPSS %ILE
98%
KEV
Not listed

Published

February 1, 2017

Last Modified

June 17, 2026

Advisory Details (7)

Auto-updated Aug 18, 2026
No patch confirmed yet. Sources: cert.
generic
http://www.securitytracker.com/id/1037680
generic

CVE-2017-3823 - PSIRT.COM

http://www.securityfocus.com/bid/95737
cert

VU#909240 - Cisco WebEx web browser extension allows arbitrary code execution

https://www.kb.cert.org/vuls/id/909240
generic

Cisco WebEx Browser Extension Remote Code Execution Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170124-webex
generic
https://bugs.chromium.org/p/project-zero/issues/detail?id=1100
generic
https://bugs.chromium.org/p/project-zero/issues/detail?id=1096
generic

How to protect yourself from the WebEx extension

https://blog.filippo.io/webex-extension-vulnerability/

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 2× in last 7d / 16× 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 117 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/windows/browser/cisco_webex_ext✓ verified
    First seen Jan 21, 2017

    Cisco WebEx Chrome Extension RCE (CVE-2017-3823)

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2017-3823?
CVE-2017-3823 is a high vulnerability published on February 1, 2017. An issue was discovered in the Cisco WebEx Extension before 1.0.7 on Google Chrome, the ActiveTouch General Plugin Container before 106 on Mozilla Firefox, the GpcContainer Class ActiveX control plugin before 10031.6.2017.0126 on Internet Explorer, and the Download Manager ActiveX control plugin…
When was CVE-2017-3823 disclosed?
CVE-2017-3823 was first published in the National Vulnerability Database on February 1, 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-2017-3823 actively exploited?
CVE-2017-3823 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27% probability of exploitation in the next 30 days, which ranks it in the top 2.0% of all scored CVEs.
What is the CVSS score of CVE-2017-3823?
CVE-2017-3823 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2017-3823?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-3823, 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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