Cisco Web Security Appliance Malformed Request Denial of Service Vulnerability
Published May 3, 2019
7.5
HIGHCVSS 3.1
EPSS 1.77%
Description
A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliance could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper validation of HTTP and HTTPS requests. An attacker could exploit this vulnerability by sending a malformed HTTP or HTTPS request to an affected device. An exploit could allow the attacker to cause a restart of the web proxy process, resulting in a temporary DoS condition.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<11.5.2-020
- Version unspecifiedStatusaffectedConstraints<11.7.0-406
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Web Security Appliance (WSA) | n/a |
|
- 11.5.1-fcs-115
- 11.5.1-fcs-124
- 11.5.1-fcs-125
- 11.7.0-fcs-334
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Nov 19, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.77% (0.01772) | 77.34th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.77% (0.01772) | 75.18th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.16% (0.00159) | 52.88th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.16% (0.00159) | 51.50th | v3 (v2023.03.01) |
| May 8, 2023 | 0.11% (0.00112) | 43.20th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.16% (0.00159) | 50.67th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.46% (0.05463) | 76.57th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.03% (0.03031) | 65.08th | v1 |
| Jan 6, 2022 | 3.03% (0.03031) | 64.74th | v1 |
| Sep 1, 2021 | 0.69% (0.00692) | 47.67th | v1 |
| Apr 14, 2021 | 0.69% (0.00692) | 0.00th | v1 |
References (1)
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-wsa-dos vendor-advisoryx_refsource_CISCOVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-wsa-dos | vendor-advisoryx_refsource_CISCOVendor Advisory |
Change history (0)
No recorded changes yet.