CVE-2021-31239

Exp

An issue found in SQLite SQLite3 v.3.35.4 that allows a remote attacker to cause a denial of service via the appendvfs.c function.

Published: 2023-05-08 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-31239 is rated High Exploit Risk (70.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.16%). 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-2021-31239

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

Exploit prediction scoring system (EPSS) score for CVE-2021-31239

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 2026-06-15 4.46% 2.16% -2.30%
2 2026-05-27 3.87% 4.46% +0.59%
3 2026-05-23 — 3.87% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-31239

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]
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 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2021-31239

OS Trackers for CVE-2021-31239

vendor priority summary link
debian unimportant CVE-2021-31239 unimportant priority: Debian including 1 source packages (sqlite3), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-31239
gentoo high CVE-2021-31239: 1 GLSA(s) (202311-03), 1 atom(s) (dev-db/sqlite); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-31239
redhat medium — https://access.redhat.com/security/cve/CVE-2021-31239
suse medium CVE-2021-31239 severity moderate: SUSE including 8 source package names (libsqlite3-0, libsqlite3-0-32bit, …), 146 product×package rows across 40 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 7, … (40 product lines)): Known Not Affected 146. https://www.suse.com/security/cve/CVE-2021-31239/
ubuntu medium CVE-2021-31239 medium priority: Ubuntu including 2 source packages (sqlite, sqlite3), 16 status rows across 8 suites (bionic, focal, jammy, kinetic, lunar, trusty, upstream, xenial): not-affected 14, DNE 1, released 1. https://ubuntu.com/security/CVE-2021-31239

Affected software / configurations for CVE-2021-31239

Vendor Product Version Raw CPE
sqlite sqlite 3.35.4 cpe:2.3:a:sqlite:sqlite:3.35.4:*:*:*:*:*:*:*

References for CVE-2021-31239

cvelogic Threat Intelligence