Xpdf
CVE-2018-18459
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Null pointer safety, defensive checks
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 5.5 (MEDIUM). Attack characteristics: local attack vector, low complexity, no privileges required, user interaction required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | A local attacker with access to the system could crash the application by dereferencing a null pointer. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
The function DCTStream::getBlock in Stream.cc in Xpdf 4.00 allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted pdf file, as demonstrated by pdftoppm. Rated medium severity (CVSS 5.5), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Check pointers before dereferencing. Use static analysis tools to detect null pointer paths.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as NULL Pointer Dereference (CWE-476), which allows attackers to crash the application by dereferencing a null pointer. The function DCTStream::getBlock in Stream.cc in Xpdf 4.00 allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted pdf file, as demonstrated by pdftoppm. Affected products include: Xpdfreader Xpdf.
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
The function DCTStream::getBlock in Stream.cc in Xpdf 4.00 allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted pdf file, as demonstrated by pdftoppm.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A null pointer dereference occurs when a program attempts to access memory through a pointer that has been set to NULL (address 0x0).
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)NVD
There is a use-after-free issue in JBIG2Stream::close() located in JBIG2Stream.cc in Xpdf 4.04. Rated high severity (CVS
XPDF 4.04 is vulnerable to Null Pointer Dereference in FoFiType1C.cc:2393. Rated high severity (CVSS 7.8), this vulnerab
XPDF commit ffaf11c was discovered to contain a heap-buffer overflow via DCTStream::lookChar() at /xpdf/Stream.cc. Rated
XPDF commit ffaf11c was discovered to contain a heap-buffer overflow via DCTStream::readScan() at /xpdf/Stream.cc. Rated
XPDF commit ffaf11c was discovered to contain a global-buffer overflow via Lexer::getObj(Object*) at /xpdf/Lexer.cc. Rat
XPDF commit ffaf11c was discovered to contain a heap-buffer overflow via DCTStream::getChar() at /xpdf/Stream.cc. Rated
XPDF commit ffaf11c was discovered to contain a heap-buffer overflow via DCTStream::readHuffSym(DCTHuffTable*) at /xpdf/
XPDF commit ffaf11c was discovered to contain a heap-buffer overflow via DCTStream::transformDataUnit at /xpdf/Stream.cc
XPDF commit ffaf11c was discovered to contain a stack overflow via __asan_memcpy at asan_interceptors_memintrinsics.cpp.
XPDF v4.04 was discovered to contain a stack overflow vulnerability via the Object::Copy class of object.cc files. Rated
There is an invalid memory access in the TextLine class in TextOutputDev.cc in Xpdf 4.0.4 because the text extractor mis
There is an invalid memory access in the function fprintf located in Error.cc in Xpdf 4.0.2. Rated high severity (CVSS 7
Exploit-DB