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TI-2021-01158 Aliases CVE-2021-1431GHSA-9pw7-f4hr-c838

Cisco IOS XE SD-WAN Software vDaemon Denial of Service Vulnerability

Priority MEDIUM 42CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

A vulnerability in the vDaemon process of Cisco IOS XE SD-WAN Software could allow an unauthenticated, remote attacker to cause a device to reload, resulting a denial of service (DoS) condition. This vulnerability is due to insufficient handling of malformed packets. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01658 76th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco IOS XE Softwareall versions—No fix listedCNA
  • Cisco IOS XE Software VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 32

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios_xe:3.15.1xbs:*:*:*:*:*:*:*3.15.1xbsVulnerableCisco
cpe:2.3:o:cisco:ios_xe:3.15.2xbs:*:*:*:*:*:*:*3.15.2xbsVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:*16.11.1VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.11.1a:*:*:*:*:*:*:*16.11.1aVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.11.1b:*:*:*:*:*:*:*16.11.1bVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.11.1c:*:*:*:*:*:*:*16.11.1cVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.11.1s:*:*:*:*:*:*:*16.11.1sVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.11.2:*:*:*:*:*:*:*16.11.2VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:*16.12.1VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.1a:*:*:*:*:*:*:*16.12.1aVulnerableCisco
  • cpe:2.3:o:cisco:ios_xe:3.15.1xbs:*:*:*:*:*:*:* Versions 3.15.1xbs Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:3.15.2xbs:*:*:*:*:*:*:* Versions 3.15.2xbs Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:* Versions 16.11.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.11.1a:*:*:*:*:*:*:* Versions 16.11.1a Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.11.1b:*:*:*:*:*:*:* Versions 16.11.1b Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.11.1c:*:*:*:*:*:*:* Versions 16.11.1c Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.11.1s:*:*:*:*:*:*:* Versions 16.11.1s Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.11.2:*:*:*:*:*:*:* Versions 16.11.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:* Versions 16.12.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.1a:*:*:*:*:*:*:* Versions 16.12.1a Vulnerable ·Cisco
Show 22 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios_xe:16.12.1c:*:*:*:*:*:*:*16.12.1cVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.1s:*:*:*:*:*:*:*16.12.1sVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.1t:*:*:*:*:*:*:*16.12.1tVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.1w:*:*:*:*:*:*:*16.12.1wVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.1x:*:*:*:*:*:*:*16.12.1xVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.1y:*:*:*:*:*:*:*16.12.1yVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.1z:*:*:*:*:*:*:*16.12.1zVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.2:*:*:*:*:*:*:*16.12.2VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.2a:*:*:*:*:*:*:*16.12.2aVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.2s:*:*:*:*:*:*:*16.12.2sVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.2t:*:*:*:*:*:*:*16.12.2tVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.3:*:*:*:*:*:*:*16.12.3VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.3a:*:*:*:*:*:*:*16.12.3aVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.3s:*:*:*:*:*:*:*16.12.3sVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.4:*:*:*:*:*:*:*16.12.4VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.4a:*:*:*:*:*:*:*16.12.4aVulnerableCisco
cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:*17.2.1VulnerableCisco
cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:*17.2.1aVulnerableCisco
cpe:2.3:o:cisco:ios_xe:17.2.1r:*:*:*:*:*:*:*17.2.1rVulnerableCisco
cpe:2.3:o:cisco:ios_xe:17.2.1v:*:*:*:*:*:*:*17.2.1vVulnerableCisco
cpe:2.3:o:cisco:ios_xe:17.2.2:*:*:*:*:*:*:*17.2.2VulnerableCisco
cpe:2.3:o:cisco:ios_xe:17.2.3:*:*:*:*:*:*:*17.2.3VulnerableCisco
  • cpe:2.3:o:cisco:ios_xe:16.12.1c:*:*:*:*:*:*:* Versions 16.12.1c Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.1s:*:*:*:*:*:*:* Versions 16.12.1s Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.1t:*:*:*:*:*:*:* Versions 16.12.1t Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.1w:*:*:*:*:*:*:* Versions 16.12.1w Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.1x:*:*:*:*:*:*:* Versions 16.12.1x Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.1y:*:*:*:*:*:*:* Versions 16.12.1y Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.1z:*:*:*:*:*:*:* Versions 16.12.1z Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.2:*:*:*:*:*:*:* Versions 16.12.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.2a:*:*:*:*:*:*:* Versions 16.12.2a Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.2s:*:*:*:*:*:*:* Versions 16.12.2s Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.2t:*:*:*:*:*:*:* Versions 16.12.2t Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.3:*:*:*:*:*:*:* Versions 16.12.3 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.3a:*:*:*:*:*:*:* Versions 16.12.3a Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.3s:*:*:*:*:*:*:* Versions 16.12.3s Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.4:*:*:*:*:*:*:* Versions 16.12.4 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.12.4a:*:*:*:*:*:*:* Versions 16.12.4a Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:* Versions 17.2.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:* Versions 17.2.1a Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:17.2.1r:*:*:*:*:*:*:* Versions 17.2.1r Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:17.2.1v:*:*:*:*:*:*:* Versions 17.2.1v Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:17.2.2:*:*:*:*:*:*:* Versions 17.2.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:17.2.3:*:*:*:*:*:*:* Versions 17.2.3 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-1431
  2. 2026-10-03 Alias added: GHSA-9pw7-f4hr-c838

References

Advisory 1

  • TI-2023-06904 Cisco is providing an update for the ongoing investigation into observed exploitation of… KEVCVSS 3.1CRITICAL 10.0
  • TI-2018-00122 Memory corruption in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-02977 Improper input validation in Cisco IOS and IOS XE Software KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
  • TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
  • TI-2017-04497 Memory corruption in Cisco IOS XE Software KEVCVSS 3.1HIGH 8.8
See all 561 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences