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TI-2021-01102 Aliases CVE-2021-1375GHSA-4c73-wx52-99cm

Cisco IOS XE Software Fast Reload Vulnerabilities

Priority LOW 31CWE-347Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-347.

Summary

Multiple vulnerabilities in the fast reload feature of Cisco IOS XE Software running on Cisco Catalyst 3850, Cisco Catalyst 9300, and Cisco Catalyst 9300L Series Switches could allow an authenticated, local attacker to either execute arbitrary code on the underlying operating system, install and boot a malicious software image, or execute unsigned binaries on an affected device. These vulnerabilities are due to improper checks performed by system boot routines. To exploit these vulnerabilities, the attacker would need privileged access to the CLI of the device. A successful exploit could allow the attacker to either execute arbitrary code on the underlying operating system or execute unsigned code and bypass the image verification check part of the secure boot process. For more information about these vulnerabilities, see the Details section of this advisory.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0024 15th 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
No
Technical impact
Total

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 · 37

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios_xe:16.5.1:*:*:*:*:*:*:*16.5.1VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.5.1a:*:*:*:*:*:*:*16.5.1aVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.6.1:*:*:*:*:*:*:*16.6.1VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.6.2:*:*:*:*:*:*:*16.6.2VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.6.3:*:*:*:*:*:*:*16.6.3VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.6.4:*:*:*:*:*:*:*16.6.4VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.6.4a:*:*:*:*:*:*:*16.6.4aVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.6.4s:*:*:*:*:*:*:*16.6.4sVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.6.5:*:*:*:*:*:*:*16.6.5VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.6.6:*:*:*:*:*:*:*16.6.6VulnerableCisco
  • cpe:2.3:o:cisco:ios_xe:16.5.1:*:*:*:*:*:*:* Versions 16.5.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.5.1a:*:*:*:*:*:*:* Versions 16.5.1a Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.6.1:*:*:*:*:*:*:* Versions 16.6.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.6.2:*:*:*:*:*:*:* Versions 16.6.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.6.3:*:*:*:*:*:*:* Versions 16.6.3 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.6.4:*:*:*:*:*:*:* Versions 16.6.4 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.6.4a:*:*:*:*:*:*:* Versions 16.6.4a Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.6.4s:*:*:*:*:*:*:* Versions 16.6.4s Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.6.5:*:*:*:*:*:*:* Versions 16.6.5 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.6.6:*:*:*:*:*:*:* Versions 16.6.6 Vulnerable ·Cisco
Show 27 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios_xe:16.6.7:*:*:*:*:*:*:*16.6.7VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.8.1:*:*:*:*:*:*:*16.8.1VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.8.1a:*:*:*:*:*:*:*16.8.1aVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.8.1s:*:*:*:*:*:*:*16.8.1sVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.9.1:*:*:*:*:*:*:*16.9.1VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.9.1s:*:*:*:*:*:*:*16.9.1sVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.9.2:*:*:*:*:*:*:*16.9.2VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.9.2s:*:*:*:*:*:*:*16.9.2sVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:*16.9.3VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.9.3a:*:*:*:*:*:*:*16.9.3aVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.9.3s:*:*:*:*:*:*:*16.9.3sVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.9.4:*:*:*:*:*:*:*16.9.4VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.10.1:*:*:*:*:*:*:*16.10.1VulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.10.1e:*:*:*:*:*:*:*16.10.1eVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.10.1s:*:*:*:*:*:*:*16.10.1sVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:*16.11.1VulnerableCisco
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:16.12.1c:*:*:*:*:*:*:*16.12.1cVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.1s:*:*:*:*:*:*:*16.12.1sVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.12.2:*:*:*:*:*:*:*16.12.2VulnerableCisco
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:17.1.1:*:*:*:*:*:*:*17.1.1VulnerableCisco
  • cpe:2.3:o:cisco:ios_xe:16.6.7:*:*:*:*:*:*:* Versions 16.6.7 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.8.1:*:*:*:*:*:*:* Versions 16.8.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.8.1a:*:*:*:*:*:*:* Versions 16.8.1a Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.8.1s:*:*:*:*:*:*:* Versions 16.8.1s Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.9.1:*:*:*:*:*:*:* Versions 16.9.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.9.1s:*:*:*:*:*:*:* Versions 16.9.1s Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.9.2:*:*:*:*:*:*:* Versions 16.9.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.9.2s:*:*:*:*:*:*:* Versions 16.9.2s Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:* Versions 16.9.3 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.9.3a:*:*:*:*:*:*:* Versions 16.9.3a Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.9.3s:*:*:*:*:*:*:* Versions 16.9.3s Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.9.4:*:*:*:*:*:*:* Versions 16.9.4 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.10.1:*:*:*:*:*:*:* Versions 16.10.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.10.1e:*:*:*:*:*:*:* Versions 16.10.1e Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.10.1s:*:*:*:*:*:*:* Versions 16.10.1s 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:16.11.1b:*:*:*:*:*:*:* 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:16.12.1c:*:*:*:*:*:*:* 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:16.12.2:*:*:*:*:*:*:* Versions 16.12.2 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:17.1.1:*:*:*:*:*:*:* Versions 17.1.1 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Cisco IOS XE Software — 20210324 Cisco IOS XE Software Fast Reload Vulnerabilities

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2021-01103 Cisco IOS XE Software Fast Reload VulnerabilitiesPriority LOW 31
    Show all 2 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-1375
  2. 2026-10-03 Alias added: GHSA-4c73-wx52-99cm

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