Is CVE-2013-5557 being actively exploited?

CVE-2013-5557 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2013-5557?

CVE-2013-5557 has a CVSS 2.0 base score of 6.3 (MEDIUM).

CVE-2013-5557

MEDIUM · CVSS 6.3EPSS 2.0%EU EUVD

The Proxy Bypass Content Rewriter feature in the WebVPN subsystem in Cisco Adaptive Security Appliance (ASA) Software 9.1(.2) and earlier allows remote authenticated users to cause a denial of service (device crash or error-recovery event) via an HTTP request that triggers a rewrite, aka Bug ID CSCug91577.

Key facts

CVSS score: 6.3 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:M/Au:S/C:N/I:N/A:C
EPSS score: 2.0% (81th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2013-5397)
Published: February 7, 2015
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2013-5397 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

cisco / adaptive security appliance software

References

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-5557(Broken Link, Vendor Advisory)
http://tools.cisco.com/security/center/viewAlert.x?alertId=37383(Vendor Advisory)
http://www.securityfocus.com/bid/72529(Third Party Advisory, VDB Entry)
https://exchange.xforce.ibmcloud.com/vulnerabilities/100694(Third Party Advisory, VDB Entry)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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