HOMEVULNERABILITIESCVE-2021-42762
MEDIUM

CVE-2021-42762

NVD-CWE-OtherPublished: October 20, 2021· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official Description

BubblewrapLauncher.cpp in WebKitGTK and WPE WebKit before 2.34.1 allows a limited sandbox bypass that allows a sandboxed process to trick host processes into thinking the sandboxed process is not confined by the sandbox, by abusing VFS syscalls that manipulate its filesystem namespace. The impact is limited to host services that create UNIX sockets that WebKit mounts inside its sandbox, and the sandboxed process remains otherwise confined. NOTE: this is similar to CVE-2021-41133.

NVD Source

Technical Analysis

CVE-2021-42762 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Affected Vendors & Products

Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
webkitgtk1 product(s)
webkitgtk
wpewebkit1 product(s)
wpe webkit
Source: NVD CPE · 7 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

ADVISORYhttp://www.openwall.com/lists/oss-security/2021/10/26/9
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/10/27/1
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/10/27/2
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/10/27/4
ADVISORYhttps://bugs.webkit.org/show_bug.cgi?id=231479
ADVISORYhttps://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q
ADVISORYhttps://www.debian.org/security/2021/dsa-4995
ADVISORYhttps://www.debian.org/security/2021/dsa-4996
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/10/26/9
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/10/27/1
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/10/27/2
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/10/27/4
ADVISORYhttps://bugs.webkit.org/show_bug.cgi?id=231479
ADVISORYhttps://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q
ADVISORYhttps://www.debian.org/security/2021/dsa-4995
ADVISORYhttps://www.debian.org/security/2021/dsa-4996

All References (22)

→
http://www.openwall.com/lists/oss-security/2021/10/26/9Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/10/27/1Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/10/27/2Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/10/27/4Mailing List · Third Party Advisory
→
https://bugs.webkit.org/show_bug.cgi?id=231479Exploit · Issue Tracking · Vendor Advisory
→
https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4qThird Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H6MGXCX7P5AHWOQ6IRT477UKT7IS4DAD/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M5J2LZQTDX53DNSKSGU7TQYCO2HKSTY4/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ON5SDVVPVPCAGFPW2GHYATZVZYLPW2L4/
→
https://www.debian.org/security/2021/dsa-4995Third Party Advisory
→
https://www.debian.org/security/2021/dsa-4996Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/10/26/9Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/10/27/1Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/10/27/2Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/10/27/4Mailing List · Third Party Advisory

Quick Facts

CVE IDCVE-2021-42762
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessNVD-CWE-Other
CISA KEVNo
Affected4 vendor(s)
PublishedOct 20, 2021

Related CVEs (NVD-CWE-Other)

CVE-2002-1468
10.0
CVE-1999-0745
10.0
CVE-2001-1080
10.0
CVE-1999-1405
10.0
CVE-2002-0747
10.0
CVE-1999-0789
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-42762 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.
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