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Vulnerability record · CVE-2018-21027 · published 11 October 2019

CVE-2018-21027: Boa memory buffer overflow vulnerability

Boa · Boa

Boa through 0.94.14rc21 allows remote attackers to trigger an out-of-memory (OOM) condition because malloc is mishandled.

9.8 CVSS 3.1 Critical EPSS 2.4% · top 16.9% CWE-119 · Memory buffer overflow
9.8CVSS 3.1 base score, v2 7.5
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Boa through 0.94.14rc21 allows remote attackers to trigger an out-of-memory (OOM) condition because malloc is mishandled.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/gpg/boa/pull/1 Third Party Advisory
https://github.com/gpg/boa/pull/1/commits/e139b87835994d007fbd64eead6c1455d7b8cf4e PatchThird Party Advisory
https://github.com/gpg/boa/pull/1 Third Party Advisory
https://github.com/gpg/boa/pull/1/commits/e139b87835994d007fbd64eead6c1455d7b8cf4e PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-44117Boa sql injection vulnerabilityBoa 0.94.14rc21 is vulnerable to SQL Injection via username. NOTE: the is disputed by multiple third parties because Boa does not ship with any suppo…EPSS 0.73%7.5CVE-2021-33558Boa vulnerabilityBoa 0.94.13 allows remote attackers to obtain sensitive information via a misconfiguration involving backup.html, preview.html, js/log.js, log.html, …EPSS 12%7.5CVE-2018-21028Boa vulnerabilityBoa through 0.94.14rc21 allows remote attackers to trigger a memory leak because of missing calls to the free function.EPSS 2.1%7.5CVE-2017-9833Boa wapopen path traversal via FILECAMERA reads files as rootA path traversal flaw is reported in /cgi-bin/wapopen in Boa 0.94.14rc21, where the FILECAMERA GET variable accepts "../.." sequences and can read fi…EPSS 68%analysed7.5CVE-2016-9564Boa improper input validation vulnerabilityBuffer overflow in send_redirect() in Boa Webserver 0.92r allows remote attackers to DoS via an HTTP GET request requesting a long URI with only '/' …EPSS 1.4%5.3CVE-2022-45956Boa incorrect authorization vulnerabilityBoa Web Server versions 0.94.13 through 0.94.14 fail to validate the correct security constraint on the HEAD HTTP method allowing everyone to bypass …EPSS 0.82%5.0CVE-2009-4496Boa improper input validation vulnerabilityBoa 0.94.14rc21 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title,…EPSS 12%9.5CVE-2026-88772Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer VulnerabilityVulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 F…KEV

Source: NIST National Vulnerability Database (record CVE-2018-21027), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.