CVE-2025-20312Network attack vector

Device reload via mishandled SNMP request

Published Sep 24, 2025 · Updated Sep 24, 2025

Denial of service in Cisco IOS XE Software allows remote authenticated users to reload affected switches through a crafted SNMP request. The SNMP subsystem mishandles an error while parsing the request, entering the published CWE-835 infinite-loop condition and forcing an unexpected reload. Reachability requires SNMPv1, v2c, or v3 plus WRED for MPLS EXP on a switch, along with a valid community string or SNMPv3 credentials.

CVSS severity7.7
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cisco IOS XE Software allows remote authenticated users to reload affected switches through a crafted SNMP request. The SNMP subsystem mishandles an error while parsing the request, entering the published CWE-835 infinite-loop condition and forcing an unexpected reload. Reachability requires SNMPv1, v2c, or v3 plus WRED for MPLS EXP on a switch, along with a valid community string or SNMPv3 credentials.

The record

CVE
CVE-2025-20312
Published
Sep 24, 2025
Updated
Sep 24, 2025
Vendor
ClamAV
Product
Cisco IOS XE Software
Classifications
CWE-835, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=17.10.1
  2. Affected versionversion=17.10.1a
  3. Affected versionversion=17.10.1b
  4. Affected versionversion=17.11.1
  5. Affected versionversion=17.11.1a
  6. Affected versionversion=17.12.1
  7. Affected versionversion=17.12.1a
  8. Affected versionversion=17.12.1w
  9. Affected versionversion=17.12.1x
  10. Affected versionversion=17.12.1y
  11. Affected versionversion=17.12.1z
  12. Affected versionversion=17.12.1z1
  13. Affected versionversion=17.12.1z2
  14. Affected versionversion=17.12.1z3
  15. Affected versionversion=17.12.1z4
  16. Affected versionversion=17.12.2
  17. Affected versionversion=17.12.2a
  18. Affected versionversion=17.12.3
  19. Affected versionversion=17.12.3a
  20. Affected versionversion=17.12.4
  21. Affected versionversion=17.12.4a
  22. Affected versionversion=17.12.4b
  23. Affected versionversion=17.12.5
  24. Affected versionversion=17.12.5a
  25. Affected versionversion=17.12.5b
  26. Affected versionversion=17.12.5c
  27. Affected versionversion=17.13.1
  28. Affected versionversion=17.13.1a
  29. Affected versionversion=17.14.1
  30. Affected versionversion=17.14.1a
  31. Affected versionversion=17.15.1
  32. Affected versionversion=17.15.1a
  33. Affected versionversion=17.15.1b
  34. Affected versionversion=17.15.1w
  35. Affected versionversion=17.15.1x
  36. Affected versionversion=17.15.1y
  37. Affected versionversion=17.15.1z
  38. Affected versionversion=17.15.2
  39. Affected versionversion=17.15.2a
  40. Affected versionversion=17.15.2b
  41. Affected versionversion=17.15.2c
  42. Affected versionversion=17.15.3
  43. Affected versionversion=17.15.3a
  44. Affected versionversion=17.15.3b
  45. Affected versionversion=17.16.1
  46. Affected versionversion=17.16.1a
  47. Affected versionversion=17.17.1
  48. Affected versionversion=17.2.1
  49. Affected versionversion=17.2.1a
  50. Affected versionversion=17.2.1r
  51. Affected versionversion=17.2.1v
  52. Affected versionversion=17.2.2
  53. Affected versionversion=17.2.3
  54. Affected versionversion=17.3.1
  55. Affected versionversion=17.3.1a
  56. Affected versionversion=17.3.1w
  57. Affected versionversion=17.3.1x
  58. Affected versionversion=17.3.1z
  59. Affected versionversion=17.3.2
  60. Affected versionversion=17.3.2a
  61. Affected versionversion=17.3.3
  62. Affected versionversion=17.3.4
  63. Affected versionversion=17.3.4a
  64. Affected versionversion=17.3.4b
  65. Affected versionversion=17.3.4c
  66. Affected versionversion=17.3.5
  67. Affected versionversion=17.3.5a
  68. Affected versionversion=17.3.5b
  69. Affected versionversion=17.3.6
  70. Affected versionversion=17.3.7
  71. Affected versionversion=17.3.8
  72. Affected versionversion=17.3.8a
  73. Affected versionversion=17.4.1
  74. Affected versionversion=17.4.1a
  75. Affected versionversion=17.4.1b
  76. Affected versionversion=17.4.2
  77. Affected versionversion=17.4.2a
  78. Affected versionversion=17.5.1
  79. Affected versionversion=17.5.1a
  80. Affected versionversion=17.6.1
  81. Affected versionversion=17.6.1a
  82. Affected versionversion=17.6.1w
  83. Affected versionversion=17.6.1x
  84. Affected versionversion=17.6.1y
  85. Affected versionversion=17.6.1z
  86. Affected versionversion=17.6.1z1
  87. Affected versionversion=17.6.2
  88. Affected versionversion=17.6.3
  89. Affected versionversion=17.6.3a
  90. Affected versionversion=17.6.4
  91. Affected versionversion=17.6.5
  92. Affected versionversion=17.6.5a
  93. Affected versionversion=17.6.6
  94. Affected versionversion=17.6.6a
  95. Affected versionversion=17.6.7
  96. Affected versionversion=17.6.8
  97. Affected versionversion=17.6.8a
  98. Affected versionversion=17.7.1
  99. Affected versionversion=17.7.1a
  100. Affected versionversion=17.7.1b
  101. Affected versionversion=17.7.2
  102. Affected versionversion=17.8.1
  103. Affected versionversion=17.8.1a
  104. Affected versionversion=17.9.1
  105. Affected versionversion=17.9.1a
  106. Affected versionversion=17.9.1w
  107. Affected versionversion=17.9.1x
  108. Affected versionversion=17.9.1x1
  109. Affected versionversion=17.9.1y
  110. Affected versionversion=17.9.1y1
  111. Affected versionversion=17.9.2
  112. Affected versionversion=17.9.2a
  113. Affected versionversion=17.9.3
  114. Affected versionversion=17.9.3a
  115. Affected versionversion=17.9.4
  116. Affected versionversion=17.9.4a
  117. Affected versionversion=17.9.5
  118. Affected versionversion=17.9.5a
  119. Affected versionversion=17.9.5b
  120. Affected versionversion=17.9.5e
  121. Affected versionversion=17.9.5f
  122. Affected versionversion=17.9.6
  123. Affected versionversion=17.9.6a
  124. Affected versionversion=17.9.7
  125. Affected versionversion=17.9.7a
  126. Affected versionversion=17.9.7b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ClamAV · Cisco IOS XE Softwareversion=17.10.1; version=17.10.1a; version=17.10.1b; version=17.11.1; version=17.11.1a; version=17.12.1; version=17.12.1a; version=17.12.1w; version=17.12.1x; version=17.12.1y; version=17.12.1z; version=17.12.1z1; version=17.12.1z2; version=17.12.1z3; version=17.12.1z4; version=17.12.2; version=17.12.2a; version=17.12.3; version=17.12.3a; version=17.12.4; version=17.12.4a; version=17.12.4b; version=17.12.5; version=17.12.5a; version=17.12.5b; version=17.12.5c; version=17.13.1; version=17.13.1a; version=17.14.1; version=17.14.1a; version=17.15.1; version=17.15.1a; version=17.15.1b; version=17.15.1w; version=17.15.1x; version=17.15.1y; version=17.15.1z; version=17.15.2; version=17.15.2a; version=17.15.2b; version=17.15.2c; version=17.15.3; version=17.15.3a; version=17.15.3b; version=17.16.1; version=17.16.1a; version=17.17.1; version=17.2.1; version=17.2.1a; version=17.2.1r; version=17.2.1v; version=17.2.2; version=17.2.3; version=17.3.1; version=17.3.1a; version=17.3.1w; version=17.3.1x; version=17.3.1z; version=17.3.2; version=17.3.2a; version=17.3.3; version=17.3.4; version=17.3.4a; version=17.3.4b; version=17.3.4c; version=17.3.5; version=17.3.5a; version=17.3.5b; version=17.3.6; version=17.3.7; version=17.3.8; version=17.3.8a; version=17.4.1; version=17.4.1a; version=17.4.1b; version=17.4.2; version=17.4.2a; version=17.5.1; version=17.5.1a; version=17.6.1; version=17.6.1a; version=17.6.1w; version=17.6.1x; version=17.6.1y; version=17.6.1z; version=17.6.1z1; version=17.6.2; version=17.6.3; version=17.6.3a; version=17.6.4; version=17.6.5; version=17.6.5a; version=17.6.6; version=17.6.6a; version=17.6.7; version=17.6.8; version=17.6.8a; version=17.7.1; version=17.7.1a; version=17.7.1b; version=17.7.2; version=17.8.1; version=17.8.1a; version=17.9.1; version=17.9.1a; version=17.9.1w; version=17.9.1x; version=17.9.1x1; version=17.9.1y; version=17.9.1y1; version=17.9.2; version=17.9.2a; version=17.9.3; version=17.9.3a; version=17.9.4; version=17.9.4a; version=17.9.5; version=17.9.5a; version=17.9.5b; version=17.9.5e; version=17.9.5f; version=17.9.6; version=17.9.6a; version=17.9.7; version=17.9.7a; version=17.9.7b

Published CVSS scores

7.7CiscoCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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