A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliances could allow an unauthenticated, remote attacker to exhaust system memory and cause a denial of service (DoS) condition on an affected system
Published Aug 15, 2018
8.6
HIGHCVSS 3.0
EPSS 4.12%
Description
A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliances could allow an unauthenticated, remote attacker to exhaust system memory and cause a denial of service (DoS) condition on an affected system. The vulnerability exists because the affected software improperly manages memory resources for TCP connections to a targeted device. An attacker could exploit this vulnerability by establishing a high number of TCP connections to the data interface of an affected device via IPv4 or IPv6. A successful exploit could allow the attacker to exhaust system memory, which could cause the system to stop processing new connections and result in a DoS condition. System recovery may require manual intervention. Cisco Bug IDs: CSCvf36610.
Affected products
-
- Version unspecifiedStatusaffectedConstraints-
- 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 Systems, Inc. | AsyncOS Software for Cisco Web Security Appliances | n/a |
|
- 9.1.1-074
- 9.1.2-010
- 9.1.2-022
- 9.1.2-039
- 10.1.0-204
- 10.1.1-235
- 10.5.1-270
- 10.5.1-296
- 10.5.2-042
- 11.0.0-641
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.
No CVSS v3.1 score for this CVE.
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:C
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 25, 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 v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (20 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.12% (0.04119) | 90.47th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.12% (0.04119) | 89.45th | v5 (v2026.06.15) |
| Nov 18, 2025 | 1.61% (0.01611) | 80.25th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.65% (0.02646) | 84.75th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.24% (0.00237) | 62.68th | v3 (v2023.03.01) |
| Feb 15, 2024 | 0.24% (0.00237) | 60.87th | v3 (v2023.03.01) |
| Jan 6, 2024 | 0.26% (0.00261) | 63.76th | v3 (v2023.03.01) |
| Sep 13, 2023 | 0.39% (0.00386) | 69.88th | v3 (v2023.03.01) |
| Aug 9, 2023 | 0.39% (0.00392) | 69.93th | v3 (v2023.03.01) |
| Jun 21, 2023 | 0.34% (0.00342) | 67.41th | v3 (v2023.03.01) |
| Mar 31, 2023 | 0.36% (0.00364) | 68.06th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.47% (0.00472) | 71.86th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.14% (0.01136) | 59.45th | v2 (v2022.01.01) |
| Oct 18, 2022 | 1.14% (0.01136) | 58.28th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.14% (0.01136) | 56.27th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.14% (0.01136) | 34.23th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.38% (0.01381) | 32.04th | v1 |
| Jan 6, 2022 | 1.38% (0.01381) | 31.30th | v1 |
| Sep 1, 2021 | 1.38% (0.01381) | 70.84th | v1 |
| Apr 14, 2021 | 1.38% (0.01381) | 0.00th | v1 |
References (3)
- http://www.securityfocus.com/bid/105098 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1041535 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180815-wsa-dos vendor-advisoryx_refsource_CISCOVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/105098 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1041535 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180815-wsa-dos | vendor-advisoryx_refsource_CISCOVendor Advisory |
Change history (0)
No recorded changes yet.