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Fencer Vulns
high 8.6

CVE-2019-1597 json

Cisco FXOS and NX-OS Lightweight Directory Access Protocol Denial of Service Vulnerabilities

published 2019-03-07 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-10154

cvss
8.6
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

Multiple vulnerabilities in the implementation of the Lightweight Directory Access Protocol (LDAP) feature in Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to the improper parsing of LDAP packets by an affected device. An attacker could exploit these vulnerabilities by sending an LDAP packet crafted using Basic Encoding Rules (BER) to an affected device. The LDAP packet must have a source IP address of an LDAP server configured on the targeted device. A successful exploit could cause the affected device to reload, resulting in a DoS condition. Firepower 4100 Series Next-Generation Firewalls are affected in versions prior to 2.0.1.201, 2.2.2.54, and 2.3.1.75. Firepower 9300 Security Appliances are affected in versions prior to 2.0.1.201, 2.2.2.54 and 2.3.1.75. MDS 9000 Series Multilayer Switches are affected in versions prior to 8.2(1). Nexus 3000 Series Switches are affected in versions prior to 7.0(3)I7(1). Nexus 3500 Platform Switches are affected in versions prior to 7.0(3)I7(2). Nexus 7000 and 7700 Series Switches are affected in versions prior to 8.2(1). Nexus 9000 Series Switches in Standalone NX-OS Mode are affected in versions prior to 7.0(3)I7(1). Cisco UCS 6200 and 6300 Fabric Interconnect devices are affected in versions prior to 3.2(2b).

Patch / fix

  • Cisco Firepower 4100 Series Next-Generation Firewalls 2.0.1.201, 2.2.2.54, 2.3.1.75
  • Cisco Firepower 9300 Security Appliance 2.0.1.201, 2.2.2.54, 2.3.1.75
  • Cisco MDS 9000 Series Multilayer Switches 8.2(1)
  • Cisco Nexus 3000 Series Switches 7.0(3)I7(1)
  • Cisco Nexus 3500 Platform Switches 7.0(3)I7(2)
  • Cisco Nexus 7000 and 7700 Series Switches 8.2(1)
  • Cisco Nexus 9000 Series Switches in Standalone NX-OS Mode 7.0(3)I7(1)
  • Cisco Cisco UCS 6200 and 6300 Fabric Interconnect 3.2(2b)

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
23 mo ago

Exploit prediction

2.54% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • Cisco Firepower 4100 Series Next-Generation Firewalls
  • Cisco Firepower 9300 Security Appliance
  • Cisco MDS 9000 Series Multilayer Switches
  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3500 Platform Switches
  • Cisco Nexus 7000 and 7700 Series Switches
  • Cisco Nexus 9000 Series Switches in Standalone NX-OS Mode
  • Cisco Cisco UCS 6200 and 6300 Fabric Interconnect

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns 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.