CVE-2017-6739

HIGHNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
8.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 11%CVSS: 8.8Exploit: NoneExposed: 0

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

A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected device.  The vulnerability is due to a buffer overflow in the affected code area. The vulnerability affects all versions of SNMP (versions 1, 2c, and 3). The attacker must know the SNMP read only community string (SNMP version 2c or earlier) or the user credentials (SNMPv3). An exploit could allow the attacker to execute arbitrary code and obtain full control of the system or to cause a reload of the affected system. Only traffic directed to the affected system can be used to exploit this vulnerability.

CVSS v3
8.8
EG Score
9.0(high)
EPSS
95.2%
KEV
⚠ Exploited

Published

July 17, 2017

Last Modified

April 22, 2026

Advisory Details (4)

Auto-updated May 2, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-6739
generic

SNMP Remote Code Execution Vulnerabilities in Cisco IOS and IOS XE Software

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp
generic
http://www.securityfocus.com/bid/99345
generic

SNMP Remote Code Execution Vulnerabilities in Cisco IOS and IOS XE Software

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 89× in last 7d / 376× 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 507 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2017-6739?
CVE-2017-6739 is a high vulnerability published on July 17, 2017. A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected device.  The vulnerability is due to a…
When was CVE-2017-6739 disclosed?
CVE-2017-6739 was first published in the National Vulnerability Database on July 17, 2017, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-6739 actively exploited?
Yes. CISA added CVE-2017-6739 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Cisco IOS and IOS XE Software. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2017-6739?
CVE-2017-6739 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2017-6739?
CVE-2017-6739 affects Cisco IOS and IOS XE Software. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2017-6739?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-6739, 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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