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CVE-2020-35503: fedoraproject fedora NULL Pointer Dereference

Modified
AliasesUBUNTU-CVE-2020-35503DEBIAN-CVE-2020-35503ALPINE-CVE-2020-35503
Published 02-06-2021Last modified 04-08-2024

Vulnerability summary

CVE-2020-35503 is a medium (CVSS 6.0) NULL Pointer Dereference vulnerability in fedoraproject fedora. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 19.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.0/10
010
Medium · v3.1 (NVD)
EPSS score
0.27%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 12 · Related 12
OPENSUSE-SU-2021:1202-1OPENSUSE-SU-2021:2789-1OPENSUSE-SU-2021:2858-1OPENSUSE-SU-2021:3614-1OPENSUSE-SU-2024:11907-1SUSE-SU-2021:2789-1

Timeline

  1. 02-06-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.27% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu2 products
  • qemuAll versions (No fix recorded)
  • qemu-hweAll versions (No fix recorded)
Alpine1 product
  • qemu< 6.1.0-r0
Debian1 product
  • qemuAll versions (No fix recorded)
Fedoraproject1 product
Qemu1 product

5 vendors · 6 products

References

8 links