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Fencer Intel
high 8.6

CVE-2019-1858 json

Cisco FXOS and NX-OS Software Simple Network Management Protocol Denial of Service Vulnerability

published 7y ago modified 4mo ago also EUVD-2019-10415

cvss
8.6
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

A vulnerability in the Simple Network Management Protocol (SNMP) input packet processor of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause the SNMP application to leak system memory, which could cause an affected device to restart unexpectedly. The vulnerability is due to improper error handling when processing inbound SNMP packets. An attacker could exploit this vulnerability by sending multiple crafted SNMP packets to an affected device. A successful exploit could allow the attacker to cause the SNMP application to leak system memory because of an improperly handled error condition during packet processing. Over time, this memory leak could cause the SNMP application to restart multiple times, leading to a system-level restart and a denial of service (DoS) condition.

Patch / fix

  • cisco nx-os 5.2\(1\)sv3\(4.1a\), 6.0\(2\)a8\(4\), 6.2\(22\), 7.0\(3\)f3\(1\), 7.0\(3\)i4\(8\), 7.0\(3\)i7\(2\), 7.1\(5\)n1\(1b\), 7.2\(0\)d1\(1\), 7.3\(4\)n1\(1a\), 8.1\(1\), 14.0\(2c\), 14.1\(1i\)
  • cisco firepower_extensible_operating_system 2.6.1.131
  • cisco fx-os 2.2.2.91, 2.3.1.130, 2.4.1.222

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
last yr.

Exploit prediction

2.39% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 8.6 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • Cisco Cisco Firepower Extensible Operating System (FXOS)

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-755 Improper Handling of Exceptional Conditions

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.