LOW
CVE-2020-25742
CWE-476Published: October 6, 2020· Updated: Jun 17, 2026
3.2
CVSS v3.1
Official Description
pci_change_irq_level in hw/pci/pci.c in QEMU before 5.1.1 has a NULL pointer dereference because pci_get_bus() might not return a valid pointer.
Technical Analysis
CVE-2020-25742 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.High
User InteractionNone
ScopeChanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L
Affected Vendors & Products
qemu1 product(s)
qemu
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (8)
→
http://www.openwall.com/lists/oss-security/2020/09/29/1Mailing List · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1883178Issue Tracking · Patch · Third Party Advisory
→
https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05294.htmlMailing List · Patch · Third Party Advisory
→
https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Flsi_nullptr1Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2020/09/29/1Mailing List · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1883178Issue Tracking · Patch · Third Party Advisory
→
https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05294.htmlMailing List · Patch · Third Party Advisory
→
https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Flsi_nullptr1Third Party Advisory
Quick Facts
CVE IDCVE-2020-25742
CVSS Score3.2 / 10
SeverityLOW
WeaknessCWE-476
CISA KEVNo
Affected1 vendor(s)
PublishedOct 6, 2020
Related CVEs (CWE-476)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-25742 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.