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No exploitation reportedFix available

CVE-2021-3508

No exploitation reported by the sources we read.

  • Published2021-04-28
  • WeaknessCWE-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

A flaw was found in PDFResurrect in version 0.22b. There is an infinite loop in get_xref_linear_skipped() in pdf.c via a crafted PDF file.

Timeline

dates in UTC
  1. 2021-04-2814:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 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-2021-3508?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-3508?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Pdfresurrect project pdfresurrect
BranchAffectedFixed in
0.22= 0.22bno fix published

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

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • pdfresurrectUbuntu:Pro:22.04:LTSall versions · fixed in 0.22-2ubuntu0.1~esm1
  • pdfresurrectUbuntu:Pro:20.04:LTSall versions · fixed in 0.19-1ubuntu0.1~esm1
  • pdfresurrectUbuntu:Pro:18.04:LTSall versions · fixed in 0.14-1ubuntu0.1~esm1
  • pdfresurrectUbuntu:Pro:16.04:LTSall versions · fixed in 0.12-6ubuntu0.2+esm1
  • pdfresurrectUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • pdfresurrectUbuntu:26.10all versions · no fixed version listed
  • pdfresurrectUbuntu:26.04:LTSall versions · no fixed version listed
  • pdfresurrectUbuntu:25.10all versions · no fixed version listed

4 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-3508 Red Hat Product Security

    pdfresurrect: infinite loop in get_xref_linear_skipped() in pdf.c

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.15.5read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • CNAweakness (CWE)CWE-835known since 2026-10-23
  • NVDweakness (CWE)CWE-835read 2026-10-23
  • FIRST EPSSEPSS score0.7 %2026-11-03
  • OSVaffected packages—

Identifiers

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
2021-04-28
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-3508?

A flaw was found in PDFResurrect in version 0.22b. There is an infinite loop in get_xref_linear_skipped() in pdf.c via a crafted PDF file.

Is CVE-2021-3508 actively exploited?

Active exploitation of CVE-2021-3508 has not been confirmed. Its EPSS score was 0.7% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3508?

CVE-2021-3508 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.

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Sources for this record