How severe is CVE-2011-2549?

CVE-2011-2549 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2011-2549 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-2549?

CVE-2011-2549 primarily affects Cisco Ios Xr. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-2549?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2011-2549 published?

CVE-2011-2549 was published on 2011-07-28 and last updated on 2026-06-16.

CVE-2011-2549

CVE-2011-2549 is a high-severity vulnerability in Cisco Ios Xr with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cisco Ios Xr
Published: 2011-07-28
Last modified: 2026-06-16

Description

Unspecified vulnerability in Cisco IOS XR 4.1.x before 4.1.1 on Cisco Aggregation Services Routers (ASR) 9000 series devices allows remote attackers to cause a denial of service (line-card reload) via an IPv4 packet, aka Bug ID CSCtr26695.

Frequently asked questions

What is CVE-2011-2549?: Unspecified vulnerability in Cisco IOS XR 4.1.x before 4.1.1 on Cisco Aggregation Services Routers (ASR) 9000 series devices allows remote attackers to cause a denial of service (line-card reload) via an IPv4 packet, aka Bug ID CSCtr26695.
How severe is CVE-2011-2549?: CVE-2011-2549 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2011-2549 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-2549?: CVE-2011-2549 primarily affects Cisco Ios Xr. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-2549?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2011-2549 published?: CVE-2011-2549 was published on 2011-07-28 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:o:cisco:ios_xr:4.1.0:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9006_router:*:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9010_router:*:*:*:*:*:*:*:*

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