How severe is CVE-2016-1426?

CVE-2016-1426 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-1426 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-1426?

CVE-2016-1426 primarily affects Cisco Ios Xr. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-1426?

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-2016-1426 published?

CVE-2016-1426 was published on 2016-07-15 and last updated on 2026-06-17.

CVE-2016-1426

CVE-2016-1426 is a high-severity vulnerability in Cisco Ios Xr with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Ios Xr
Published: 2016-07-15
Last modified: 2026-06-17

Description

Cisco IOS XR 5.x through 5.2.5 on NCS 6000 devices allows remote attackers to cause a denial of service (timer consumption and Route Processor reload) via crafted SSH traffic, aka Bug ID CSCux76819.

Frequently asked questions

What is CVE-2016-1426?: Cisco IOS XR 5.x through 5.2.5 on NCS 6000 devices allows remote attackers to cause a denial of service (timer consumption and Route Processor reload) via crafted SSH traffic, aka Bug ID CSCux76819.
How severe is CVE-2016-1426?: CVE-2016-1426 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-1426 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-1426?: CVE-2016-1426 primarily affects Cisco Ios Xr. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-1426?: 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-2016-1426 published?: CVE-2016-1426 was published on 2016-07-15 and last updated on 2026-06-17.

References

Affected products (14)

cpe:2.3:o:cisco:ios_xr:5.0.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.0.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.0_base:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.1.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.1.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.1.1.k9sec:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.1.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.1.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.2.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.2.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.2.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.2.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:5.2.5:*:*:*:*:*:*:*

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