CVE-2021-46312: An issue was discovered IW44EncodeCodec.cpp in djvulibre 3.5.28 in allows attackers to cause a denial of service via divide by zero.
Noroxi assessment
Priority: Monitor (action score 26/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 1% (FIRST EPSS); higher than 64.4% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
- Fixed version: djvulibre (Debian:11) 3.5.28-2.2~deb11u1; djvulibre (Debian:12) 3.5.28-2.2~deb12u1; djvulibre (Debian:13) 3.5.28-2.2.
Low priority for now. Upgrade to djvulibre (Debian:11) 3.5.28-2.2~deb11u1; djvulibre (Debian:12) 3.5.28-2.2~deb12u1; djvulibre (Debian:13) 3.5.28-2.2 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
- Published
- Aug 22, 2023
- Updated
- Jun 17, 2026
- EPSS
- 1.0% · 64th percentile
- CWE
- CWE-369
Report tools
Action score
26
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.0%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| djvulibre project | djvulibre | cpe:2.3:a:djvulibre_project:djvulibre |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- djvulibre project djvulibre3.5.28
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:11 | djvulibre | before 3.5.28-2.2~deb11u1 | 3.5.28-2.2~deb11u1 |
| Debian:12 | djvulibre | before 3.5.28-2.2~deb12u1 | 3.5.28-2.2~deb12u1 |
| Debian:13 | djvulibre | before 3.5.28-2.2 | 3.5.28-2.2 |
| openSUSE:Leap 15.4 | djvulibre | before 3.5.27-150200.11.14.1 | 3.5.27-150200.11.14.1 |
| openSUSE:Tumbleweed | djvulibre | before 3.5.28-6.1 | 3.5.28-6.1 |
| SUSE:Linux Enterprise Module for Desktop Applications 15 SP4 | djvulibre | before 3.5.27-150200.11.14.1 | 3.5.27-150200.11.14.1 |
| SUSE:Linux Enterprise Software Development Kit 12 SP5 | djvulibre | before 3.5.25.3-5.22.1 | 3.5.25.3-5.22.1 |
Same product
djvulibre project: all recordsOther highest-scoring records for the same primary product.
- CVE-2012-6535DjVuLibre before 3.5.25.3, as used in Evince, Sumatra PDF Reader, VuDroid, and other products, allows remote attackers to execute arbitrary…38Monitor
- CVE-2021-3500A flaw was found in djvulibre-3.5.28 and earlier.31Monitor
- CVE-2021-32493A flaw was found in djvulibre-3.5.28 and earlier.31Monitor
Published before and after this one in the same product
- ← EarlierCVE-2021-32492Jun 24, 2021 · A flaw was found in djvulibre-3.5.28 and earlier.31Monitor
- ← EarlierCVE-2021-3630Jun 30, 2021 · An out-of-bounds write vulnerability was found in DjVuLibre in DJVU::DjVuTXT::decode() in DjVuText.cpp via a crafted djvu file which may…22Monitor
- ← EarlierCVE-2021-46310Aug 22, 2023 · An issue was discovered IW44Image.cpp in djvulibre 3.5.28 in allows attackers to cause a denial of service via divide by zero.26Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:djvulibre | 3.5.28-2.2~deb12u1 · Debian:12 | Package registry (OSV) |
| opensuse:djvulibre | 3.5.27-150200.11.14.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| suse:djvulibre | 3.5.27-150200.11.14.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP4 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-369 · Divide By ZeroCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (5 more)Show less
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HN4JOIBNMJMW2NQSGT6DCDCQZJ2ROFM7/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XEEGAR4WUF6LTOJEHSON7I2MBTPFTVR5/
- lists.debian.org/debian-lts-announce/2025/07/msg00007.html
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HN4JOIBNMJMW2NQSGT6DCDCQZJ2ROFM7/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XEEGAR4WUF6LTOJEHSON7I2MBTPFTVR5/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.