How severe is CVE-2018-17281?

CVE-2018-17281 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-17281 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 53% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-17281?

CVE-2018-17281 primarily affects Digium Asterisk. In total, 33 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-17281?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-17281 published?

CVE-2018-17281 was published on 2018-09-24 and last updated on 2026-06-17.

CVE-2018-17281

CVE-2018-17281 is a high-severity vulnerability in Digium Asterisk with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 53% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 53% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Digium Asterisk
Published: 2018-09-24
Last modified: 2026-06-17

Description

There is a stack consumption vulnerability in the res_http_websocket.so module of Asterisk through 13.23.0, 14.7.x through 14.7.7, and 15.x through 15.6.0 and Certified Asterisk through 13.21-cert2. It allows an attacker to crash Asterisk via a specially crafted HTTP request to upgrade the connection to a websocket.

Frequently asked questions

What is CVE-2018-17281?: There is a stack consumption vulnerability in the res_http_websocket.so module of Asterisk through 13.23.0, 14.7.x through 14.7.7, and 15.x through 15.6.0 and Certified Asterisk through 13.21-cert2. It allows an attacker to crash Asterisk via a specially crafted HTTP request to upgrade the connection to a websocket.
How severe is CVE-2018-17281?: CVE-2018-17281 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-17281 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 53% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-17281?: CVE-2018-17281 primarily affects Digium Asterisk. In total, 33 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-17281?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-17281 published?: CVE-2018-17281 was published on 2018-09-24 and last updated on 2026-06-17.

References

Affected products (33)

cpe:2.3:a:digium:asterisk:*:*:*:*:lts:*:*:*
cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:*:*:*:*:standard:*:*:*
cpe:2.3:a:digium:certified_asterisk:11.6:cert12:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:11.6:cert13:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:11.6:cert14:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:11.6:cert15:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:11.6:cert16:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:11.6:cert17:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:11.6:cert18:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.1:cert3:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.1:cert4:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.1:cert5:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.1:cert6:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.1:cert7:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.1:cert8:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.8:cert1:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.8:cert2:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.8:cert3:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.8:cert4:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.13:cert1:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.13:cert2:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.13:cert3:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.13:cert4:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.13:cert5:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.13:cert6:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.13:cert7:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.13:cert8:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.13:cert9:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.21:cert1:*:*:lts:*:*:*
cpe:2.3:a:digium:certified_asterisk:13.21:cert2:*:*:lts:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

More vulnerabilities in Digium Asterisk

CVE-2022-26651 — Critical (CVSS 9.8): An issue was discovered in Asterisk through 19.x and Certified Asterisk through 16.8-cert13. The func_odbc module…
CVE-2017-14100 — Critical (CVSS 9.8): In Asterisk 11.x before 11.25.2, 13.x before 13.17.1, and 14.x before 14.6.1 and Certified Asterisk 11.x before…
CVE-2022-26499 — Critical (CVSS 9.1): An SSRF issue was discovered in Asterisk through 19.x. When using STIR/SHAKEN, it's possible to send arbitrary requests…
CVE-2014-8418 — Critical (CVSS 9.0): The DB dialplan function in Asterisk Open Source 1.8.x before 1.8.32, 11.x before 11.1.4.1, 12.x before 12.7.1, and…
CVE-2011-1599 — Critical (CVSS 9.0): manager.c in the Manager Interface in Asterisk Open Source 1.4.x before 1.4.40.1, 1.6.1.x before 1.6.1.25, 1.6.2.x…
CVE-2019-18610 — High (CVSS 8.8): An issue was discovered in manager.c in Sangoma Asterisk through 13.x, 16.x, 17.x and Certified Asterisk 13.21 through…

All CVEs affecting Digium Asterisk →

Other CWE-400 (Uncontrolled Resource Consumption) vulnerabilities

CVE-2026-46775 — Critical (CVSS 9.9): Vulnerability in Oracle REST Data Services (component: Core). Supported versions that are affected are 24.2.0-26.1.0.…
CVE-2025-61303 — Critical (CVSS 9.8): Hatching Triage Sandbox Windows 10 build 2004 (2025-08-14) and Windows 10 LTSC 2021(2025-08-14) contains a…
CVE-2025-43193 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.6, macOS Sonoma 14.7.7,…
CVE-2025-24269 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.4. An app may be able to…
CVE-2025-24264 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in Safari 18.4, iOS 18.4 and iPadOS 18.4,…
CVE-2025-24260 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.4, macOS Sonoma 14.7.5,…

Browse all CWE-400 (Uncontrolled Resource Consumption) vulnerabilities →