No exploitation reportedFix available

CVE-2021-31812

Q: Is CVE-2021-31812 actively exploited?

Active exploitation of CVE-2021-31812 has not been confirmed. Its EPSS score was 3.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-31812?

CVE-2021-31812 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2021-06-12
Fixed in2.0.24
WeaknessCWE-834 · CWE-835

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Apache PDFBox, a carefully crafted PDF file can trigger an infinite loop while loading the file. This issue affects Apache PDFBox version 2.0.23 and prior 2.0.x versions.

Timeline

dates in UTC

2021-06-1210:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-31812?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-31812?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV · NVD

pdfbox

Branch	Affected	Fixed in	Source
2.0	≥ 2.0.0, < 2.0.24	2.0.24	OSV

Oracle banking corporate lending process management

Branch	Affected	Fixed in	Source
14.2	= 14.2.0	no fix published	NVD
14.3	= 14.3.0	no fix published	NVD
14.5	= 14.5.0	no fix published	NVD

Oracle banking credit facilities process management

Branch	Affected	Fixed in	Source
14.2	= 14.2.0	no fix published	NVD
14.3	= 14.3.0	no fix published	NVD
14.5	= 14.5.0	no fix published	NVD

6 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update pdfbox to 2.0.24

Advisories and patches

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.15.5read 2026-10-23
NVDCVSS 2.04.3read 2026-10-23
CNAweakness (CWE)CWE-834read 2026-10-23
NVDweakness (CWE)CWE-835read 2026-10-23
FIRST EPSSEPSS score3.1 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published: 2021-06-12
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-31812?

In Apache PDFBox, a carefully crafted PDF file can trigger an infinite loop while loading the file. This issue affects Apache PDFBox version 2.0.23 and prior 2.0.x versions.

Is CVE-2021-31812 actively exploited?

Active exploitation of CVE-2021-31812 has not been confirmed. Its EPSS score was 3.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-31812?

CVE-2021-31812 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Running pdfbox? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this product CISA KEV additions, October 2026 Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database