CVE-2020-35512: A use-after-free flaw was found in D-Bus Development branch <= 1.13.16, dbus-1.12.x stable branch <= 1.12.18,

Q: How do I fix CVE-2020-35512?

dbus: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2020-35512 being exploited?

CVE-2020-35512 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-35512 affect?

CVE-2020-35512 affects dbus. Severity is high (CVSS 7.8). A use-after-free flaw was found in D-Bus Development branch <= 1.13.16, dbus-1.12.x stable branch <= 1.12.18, and dbus-1.10.x and older branches <= 1.10.30 when a system has multiple usernames sharing the same UID. When a set of policy rule

Routine

HIGH 7.8MITIGATE

CVE-2020-35512 is a high-severity flaw (CVSS 7.8) affecting dbus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A use-after-free flaw was found in D-Bus Development branch <= 1.13.16, dbus-1.12.x stable branch <= 1.12.18, and dbus-1.10.x and older branches <= 1.10.30 when a system has multiple usernames sharing the same UID. When a set of policy rules references these usernames, D-Bus may free some memory in the heap, which is still used by data structures necessary for the other usernames sharing the UID, possibly leading to a crash or other undefined beh

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-416
Published	2021-02-15
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: freedesktop

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-02-15 17:15 UTCPublished CVE record published
2026-06-17 03:13 UTCUpdated Record last modified

freedesktop dbus MITIGATE

Affected: 1.12.20

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy dbus || rpm -q dbus || dbus --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Downgrade not recommended

This is a core system component: downgrading can break the OS. Apply the distro update or the vendor mitigation.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-35512?

dbus: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-35512 being exploited?

CVE-2020-35512 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-35512 affect?

CVE-2020-35512 affects dbus. Severity is high (CVSS 7.8). A use-after-free flaw was found in D-Bus Development branch <= 1.13.16, dbus-1.12.x stable branch <= 1.12.18, and dbus-1.10.x and older branches <= 1.10.30 when a system has multiple usernames sharing the same UID. When a set of policy rule

How urgent is CVE-2020-35512?

Priority 34/100. High severity

Related CVEs

CVE-2023-34969 MEDIUM 6.5 UPGRADE MITIGATE D-Bus before 1.15.6 sometimes allows unprivileged users to crash dbus-daemon
CVE-2022-42012 MEDIUM 6.5 UPGRADE MITIGATE An issue was discovered in D-Bus before 1.12.24, 1.13.x and 1.14.x before 1.14.4, and 1.15.x before 1.15.2
CVE-2022-42011 MEDIUM 6.5 UPGRADE MITIGATE An issue was discovered in D-Bus before 1.12.24, 1.13.x and 1.14.x before 1.14.4, and 1.15.x before 1.15.2
CVE-2022-42010 MEDIUM 6.5 UPGRADE MITIGATE An issue was discovered in D-Bus before 1.12.24, 1.13.x and 1.14.x before 1.14.4, and 1.15.x before 1.15.2
CVE-2020-12049 MEDIUM 5.5 UPGRADE MITIGATE An issue was discovered in dbus >= 1.3.0 before 1.12.18

References

← Back to latest CVEs