CVE-2021-32491

A flaw was found in djvulibre-3.5.28 and earlier. An integer overflow in function render() in tools/ddjvu via crafted djvu file may lead to application crash and other consequences.

Published: 2021-06-24 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-32491 is rated Moderate Risk (50.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.88%). Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2021-32491

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 0.28% 0.88% +0.59%
2 2026-05-26 0.36% 0.28% -0.08%
3 2025-12-28 — 0.36% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-32491

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2021-32491

OS Trackers for CVE-2021-32491

vendor priority summary link
alpine high CVE-2021-32491: 1 source package rows (djvulibre); 17 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 17, open 0. https://security.alpinelinux.org/vuln/CVE-2021-32491
debian not yet assigned CVE-2021-32491 not yet assigned priority: Debian including 1 source packages (djvulibre), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-32491
suse high CVE-2021-32491 severity important: SUSE including 22 source package names (djvulibre-3.5.27-11.3.1, djvulibre-3.5.27-lp152.7.3.1, …), 92 product×package rows across 56 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (56 product lines)): Fixed 92. https://www.suse.com/security/cve/CVE-2021-32491/
ubuntu medium CVE-2021-32491 medium priority: Ubuntu including 1 source packages (djvulibre), 9 status rows across 9 suites (bionic, focal, groovy, hirsute, impish, jammy, trusty, upstream, xenial): released 6, not-affected 2, DNE 1. https://ubuntu.com/security/CVE-2021-32491

Affected software / configurations for CVE-2021-32491

Vendor Product Version Raw CPE
djvulibre_project djvulibre <= 3.5.28 cpe:2.3:a:djvulibre_project:djvulibre:*:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References for CVE-2021-32491

URL Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1943684 Issue Tracking Third Party Advisory
https://www.debian.org/security/2021/dsa-5032 Third Party Advisory
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