How severe is CVE-2015-0593?

CVE-2015-0593 has a CVSS 2.0 base score of 7.1, rated high severity.

Is CVE-2015-0593 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-0593?

CVE-2015-0593 primarily affects Cisco Ios. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-0593?

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-2015-0593 published?

CVE-2015-0593 was published on 2015-02-13 and last updated on 2026-06-17.

CVE-2015-0593

CVE-2015-0593 is a high-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 7.1. 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 2.0 base score 7.1)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Ios
Published: 2015-02-13
Last modified: 2026-06-17

Description

The Zone-Based Firewall implementation in Cisco IOS 12.4(122)T and earlier does not properly manage session-object structures, which allows remote attackers to cause a denial of service (device reload) via crafted network traffic, aka Bug ID CSCul65003.

Frequently asked questions

What is CVE-2015-0593?: The Zone-Based Firewall implementation in Cisco IOS 12.4(122)T and earlier does not properly manage session-object structures, which allows remote attackers to cause a denial of service (device reload) via crafted network traffic, aka Bug ID CSCul65003.
How severe is CVE-2015-0593?: CVE-2015-0593 has a CVSS 2.0 base score of 7.1, rated high severity.
Is CVE-2015-0593 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-0593?: CVE-2015-0593 primarily affects Cisco Ios. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-0593?: 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-2015-0593 published?: CVE-2015-0593 was published on 2015-02-13 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:cisco:ios:15.4\(1.12\)t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(1.19\)t:*:*:*:*:*:*:*

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