Cisco Web Security Appliance HTTPS Certificate Denial of Service Vulnerability
Published Jul 4, 2019
8.6
HIGHCVSS 3.1
EPSS 1.35%
Description
A vulnerability in the HTTPS decryption feature of Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to insufficient validation of Secure Sockets Layer (SSL) server certificates. An attacker could exploit this vulnerability by installing a malformed certificate in a web server and sending a request to it through the Cisco WSA. A successful exploit could allow the attacker to cause an unexpected restart of the proxy process on an affected device.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<10.5.5-005
- 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 |
|
Configuration 2
- 10.5.2-072
- 10.5.3-025
- 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:C/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 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.35% (0.01347) | 70.46th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.35% (0.01347) | 70.19th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.16% (0.00157) | 52.55th | v3 (v2023.03.01) |
| Jun 26, 2024 | 0.16% (0.00157) | 52.35th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.16% (0.00157) | 50.35th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Mar 31, 2022 | 5.46% (0.05463) | 77.11th | v2 (v2022.01.01) |
| Jan 6, 2022 | 4.49% (0.04490) | 74.82th | v1 |
| Jan 5, 2022 | 1.04% (0.01037) | 63.76th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.04% (0.01037) | 0.00th | v1 |
References (2)
- http://www.securityfocus.com/bid/109049 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-wsa-dos vendor-advisoryx_refsource_CISCOVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/109049 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-wsa-dos | vendor-advisoryx_refsource_CISCOVendor Advisory |
Change history (0)
No recorded changes yet.