HOMEVULNERABILITIESCVE-2018-21027
CRITICAL

CVE-2018-21027

CWE-119Published: October 11, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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

NVD Source

Technical Analysis

CVE-2018-21027 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

boa1 product(s)
boa
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/gpg/boa/pull/1/commits/e139b87835994d007fbd64eead6c1455d7b8cf4e
PATCHhttps://github.com/gpg/boa/pull/1/commits/e139b87835994d007fbd64eead6c1455d7b8cf4e
ADVISORYhttps://github.com/gpg/boa/pull/1
ADVISORYhttps://github.com/gpg/boa/pull/1

All References (4)

→
https://github.com/gpg/boa/pull/1Third Party Advisory
→
https://github.com/gpg/boa/pull/1/commits/e139b87835994d007fbd64eead6c1455d7b8cf4ePatch · Third Party Advisory
→
https://github.com/gpg/boa/pull/1Third Party Advisory
→
https://github.com/gpg/boa/pull/1/commits/e139b87835994d007fbd64eead6c1455d7b8cf4ePatch · Third Party Advisory

Quick Facts

CVE IDCVE-2018-21027
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-119
CISA KEVNo
Affected1 vendor(s)
PublishedOct 11, 2019

Related CVEs (CWE-119)

CVE-2012-5958
10.0
CVE-2015-5548
10.0
CVE-2015-5547
10.0
CVE-2015-5545
10.0
CVE-2015-5544
10.0
CVE-2007-0886
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-21027 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2018-21027·NVD