CVE-2018-18020: qpdf_project qpdf Uncontrolled Recursion
CVSS: 4.3v2.0MediumModified
AliasesUBUNTU-CVE-2018-18020DEBIAN-CVE-2018-18020
Published 06-10-2018Last modified 05-08-2024
Vulnerability summary
CVE-2018-18020 is a medium (CVSS 4.3) Uncontrolled Recursion vulnerability in qpdf_project qpdf. EPSS estimates a 1.21% chance of exploitation in the next 30 days, higher than 67.9% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
4.3/10
010
Medium · v2.0 (NVD)EPSS score
1.21%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Advisory lineage
Upstream 0 · Downstream 3 · Related 2Timeline
- 06-10-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.
CVSS metrics
4 scores · 3 sources · 2 versionsLow 3.3Preferred score · NVD (NIST)
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:LSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated3.3LowCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- OSV · DebianEcosystem advisory · calculated3.3LowCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.21%
Chance of exploitation in the next 30 days
Percentile
68%
Versus all other CVEs
30-day change
0.00 pp
From 1.21% on 20-09-2026
20-09-202620-10-2026
EPSS score1.21%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundQpdf
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Debian1 product
- qpdf< 9.0.0-1
Qpdf_project1 product
- qpdf8.2.1
Ubuntu1 product
- qpdf< 8.0.2-3~16.04.1+esm1 | < 8.0.2-3ubuntu0.1
3 vendors · 3 products
