CVE-2021-3905

Exp

A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker could use this flaw to potentially exhaust available memory by keeping sending packet fragments.

Published: 2022-08-23 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-3905 is rated Exploit Available (57.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.16%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-3905

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-3905

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-30 0.15% 0.16% +0.01%
2 2025-12-28 0.17% 0.15% -0.02%
3 2025-12-27 — 0.17% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-3905

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2021-3905

OS Trackers for CVE-2021-3905

vendor priority summary link
alpine high CVE-2021-3905: 1 source package rows (openvswitch); 11 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 11. https://security.alpinelinux.org/vuln/CVE-2021-3905
debian unimportant CVE-2021-3905 unimportant priority: Debian including 1 source packages (openvswitch), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-3905
gentoo low CVE-2021-3905: 1 GLSA(s) (202311-16), 1 atom(s) (net-misc/openvswitch); latest impact low. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-3905
redhat medium — https://access.redhat.com/security/cve/CVE-2021-3905
suse medium CVE-2021-3905 severity moderate: SUSE including 20 source package names (libopenvswitch-2_11-0, libopenvswitch-2_13-0, …), 65 product×package rows across 28 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (28 product lines)): Known Not Affected 65. https://www.suse.com/security/cve/CVE-2021-3905/
ubuntu medium CVE-2021-3905 medium priority: Ubuntu including 1 source packages (openvswitch), 8 status rows across 8 suites (bionic, focal, hirsute, impish, jammy, trusty, upstream, xenial): not-affected 5, ignored 1, needs-triage 1, released 1. https://ubuntu.com/security/CVE-2021-3905

Affected software / configurations for CVE-2021-3905

Vendor Product Version Raw CPE
openvswitch openvswitch < 2.17.0 cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
redhat enterprise_linux_fast_datapath 7.0 cpe:2.3:a:redhat:enterprise_linux_fast_datapath:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_fast_datapath 8.0 cpe:2.3:a:redhat:enterprise_linux_fast_datapath:8.0:*:*:*:*:*:*:*
canonical ubuntu_linux 21.10 cpe:2.3:o:canonical:ubuntu_linux:21.10:*:*:*:*:*:*:*
fedoraproject fedora 35 cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

References for CVE-2021-3905

cvelogic Threat Intelligence