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CVE-2021-1288

Cisco IOS XR Software Enf Broker Denial of Service Vulnerability

HIGH
7.5
CVSS Score
Published: February 4, 2021 at 04:35 PM UTC
Updated: June 17, 2026 at 03:31 AM UTC
1 product affected across 1 vendorIOS Xr

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

Multiple vulnerabilities in the ingress packet processing function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS Xr· Cisco
95%
5.0.0 ≤ v < 5.2.65.3.0 ≤ v < 5.3.46.0.0 ≤ v < 6.0.2
Affected range stops below 5.2.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.3.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.0.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-dos-WwDdghs2

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-399NVD-CWE-noinfo

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