CVE-2013-5557 — 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

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MEDIUM

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

Published Feb 7, 2015

6.3

MEDIUM

CVSS 2.0

EPSS 2.01%

Description

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.

Affected products

Remediation

No remediation recorded yet.

Metrics

2.01% 0.02008

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.02008

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	2.01% (0.02008)	80.12th	v5 (v2026.06.15)
Jun 15, 2026	2.01% (0.02008)	78.22th	v5 (v2026.06.15)
Mar 17, 2025	0.34% (0.00345)	54.92th	v4 (v2025.03.14)
Dec 12, 2024	0.18% (0.00175)	55.90th	v3 (v2023.03.01)
Jun 21, 2024	0.18% (0.00175)	54.85th	v3 (v2023.03.01)
Mar 7, 2023	0.18% (0.00175)	52.84th	v3 (v2023.03.01)
Mar 6, 2023	1.13% (0.01132)	56.11th	v2 (v2022.01.01)
Sep 22, 2022	1.13% (0.01132)	54.59th	v2 (v2022.01.01)
Apr 1, 2022	1.13% (0.01132)	52.58th	v2 (v2022.01.01)
Feb 4, 2022	1.13% (0.01132)	30.65th	v2 (v2022.01.01)

Weaknesses (0)

No CWE recorded.

References (4)

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-5557
vendor-advisoryx_refsource_CISCOBroken LinkVendor Advisory
http://tools.cisco.com/security/center/viewAlert.x?alertId=37383
x_refsource_CONFIRMVendor Advisory
http://www.securityfocus.com/bid/72529
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/100694
vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry

Link	Providers	Tags
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-5557		vendor-advisoryx_refsource_CISCOBroken LinkVendor Advisory
http://tools.cisco.com/security/center/viewAlert.x?alertId=37383		x_refsource_CONFIRMVendor Advisory
http://www.securityfocus.com/bid/72529		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/100694		vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Feb 7, 2015

Updated Aug 6, 2024

Reserved Aug 22, 2013

Link CVE-2013-5557

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2013-5557

Red Hat

Severity n/a

Public date n/a

Links CVE-2013-5557