CVE-2020-15702 | TOCTOU in apport

TOCTOU Race Condition vulnerability in apport allows a local attacker to escalate privileges and execute arbitrary code. An attacker may exit the crashed process and exploit PID recycling to spawn a root process with the same PID as the crashed process, which can then be used to escalate privileges. Fixed in 2.20.1-0ubuntu2.24, 2.20.9 versions prior to 2.20.9-0ubuntu7.16 and 2.20.11 versions prior to 2.20.11-0ubuntu27.6. Was ZDI-CAN-11234.

Published: 2020-08-06 Last update: 2025-11-03 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-15702 is rated Low Risk (32.7/100): CVSS High severity, with low exploitation likelihood (EPSS 0.04%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-15702

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-28 0.06% 0.04% -0.01%
2 2025-12-27 0.04% 0.06% +0.01%
3 2025-11-21 — 0.04% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-15702

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.0 3.1 HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.0 5.9 [email protected]
7.0 3.1 HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.0 5.9 [email protected]
4.4 2.0 MEDIUM
AV:L/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.4 6.4 [email protected]

Weakness enumeration for CVE-2020-15702

OS Trackers for CVE-2020-15702

vendor priority summary link
suse high CVE-2020-15702 severity important: SUSE including 2 source package names (apport, apport-gtk), 3 product×package rows across 2 product lines (SUSE Linux Enterprise Server 11 SP3, SUSE Linux Enterprise Server 11 SP3 for Teradata): Known Not Affected 3. https://www.suse.com/security/cve/CVE-2020-15702/
ubuntu medium CVE-2020-15702 medium priority: Ubuntu including 1 source packages (apport), 6 status rows across 6 suites (bionic, eoan, focal, trusty, upstream, xenial): released 4, ignored 1, needs-triage 1. https://ubuntu.com/security/CVE-2020-15702

Affected software / configurations for CVE-2020-15702

Vendor Product Version Raw CPE
canonical apport 2.20.11-0ubuntu8 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu8:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu9 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu9:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu10 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu10:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu11 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu11:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu12 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu12:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu13 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu13:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu14 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu14:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu15 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu15:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu16 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu16:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu17 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu17:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu18 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu18:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu19 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu19:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu20 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu20:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu21 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu21:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu22 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu22:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu23 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu23:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu24 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu24:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu25 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu25:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu26 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu26:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu27 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu27:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu27.2 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu27.2:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu27.3 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu27.3:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu27.4 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu27.4:*:*:*:*:*:*:*
canonical apport 2.20.11-0ubuntu27.5 cpe:2.3:a:canonical:apport:2.20.11-0ubuntu27.5:*:*:*:*:*:*:*
canonical apport 2.20.7-0ubuntu3 cpe:2.3:a:canonical:apport:2.20.7-0ubuntu3:*:*:*:*:*:*:*
canonical apport 2.20.7-0ubuntu3.1 cpe:2.3:a:canonical:apport:2.20.7-0ubuntu3.1:*:*:*:*:*:*:*
canonical apport 2.20.7-0ubuntu4 cpe:2.3:a:canonical:apport:2.20.7-0ubuntu4:*:*:*:*:*:*:*
canonical apport 2.20.8-0ubuntu1 cpe:2.3:a:canonical:apport:2.20.8-0ubuntu1:*:*:*:*:*:*:*
canonical apport 2.20.8-0ubuntu2 cpe:2.3:a:canonical:apport:2.20.8-0ubuntu2:*:*:*:*:*:*:*
canonical apport 2.20.8-0ubuntu3 cpe:2.3:a:canonical:apport:2.20.8-0ubuntu3:*:*:*:*:*:*:*
canonical apport 2.20.8-0ubuntu4 cpe:2.3:a:canonical:apport:2.20.8-0ubuntu4:*:*:*:*:*:*:*
canonical apport 2.20.8-0ubuntu5 cpe:2.3:a:canonical:apport:2.20.8-0ubuntu5:*:*:*:*:*:*:*
canonical apport 2.20.8-0ubuntu6 cpe:2.3:a:canonical:apport:2.20.8-0ubuntu6:*:*:*:*:*:*:*
canonical apport 2.20.8-0ubuntu7 cpe:2.3:a:canonical:apport:2.20.8-0ubuntu7:*:*:*:*:*:*:*
canonical apport 2.20.8-0ubuntu8 cpe:2.3:a:canonical:apport:2.20.8-0ubuntu8:*:*:*:*:*:*:*
canonical apport 2.20.8-0ubuntu9 cpe:2.3:a:canonical:apport:2.20.8-0ubuntu9:*:*:*:*:*:*:*
canonical apport 2.20.8-0ubuntu10 cpe:2.3:a:canonical:apport:2.20.8-0ubuntu10:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu1 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu1:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu2 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu2:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu3 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu3:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu4 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu4:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu5 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu5:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu6 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu6:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.1 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.1:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.2 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.2:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.3 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.3:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.4 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.4:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.5 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.5:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.6 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.6:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.7 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.7:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.8 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.8:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.9 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.9:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.10 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.10:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.11 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.11:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.12 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.12:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.13 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.13:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.14 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.14:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.15 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.15:*:*:*:*:*:*:*
canonical apport 2.19.1-0ubuntu3 cpe:2.3:a:canonical:apport:2.19.1-0ubuntu3:*:*:*:*:*:*:*
canonical apport 2.19.2-0ubuntu1 cpe:2.3:a:canonical:apport:2.19.2-0ubuntu1:*:*:*:*:*:*:*
canonical apport 2.19.2-0ubuntu2 cpe:2.3:a:canonical:apport:2.19.2-0ubuntu2:*:*:*:*:*:*:*
canonical apport 2.19.2-0ubuntu3 cpe:2.3:a:canonical:apport:2.19.2-0ubuntu3:*:*:*:*:*:*:*
canonical apport 2.19.2-0ubuntu4 cpe:2.3:a:canonical:apport:2.19.2-0ubuntu4:*:*:*:*:*:*:*
canonical apport 2.19.2-0ubuntu5 cpe:2.3:a:canonical:apport:2.19.2-0ubuntu5:*:*:*:*:*:*:*
canonical apport 2.19.2-0ubuntu6 cpe:2.3:a:canonical:apport:2.19.2-0ubuntu6:*:*:*:*:*:*:*
canonical apport 2.19.2-0ubuntu7 cpe:2.3:a:canonical:apport:2.19.2-0ubuntu7:*:*:*:*:*:*:*
canonical apport 2.19.2-0ubuntu8 cpe:2.3:a:canonical:apport:2.19.2-0ubuntu8:*:*:*:*:*:*:*
canonical apport 2.19.2-0ubuntu9 cpe:2.3:a:canonical:apport:2.19.2-0ubuntu9:*:*:*:*:*:*:*
canonical apport 2.19.3-0ubuntu1 cpe:2.3:a:canonical:apport:2.19.3-0ubuntu1:*:*:*:*:*:*:*
canonical apport 2.19.3-0ubuntu2 cpe:2.3:a:canonical:apport:2.19.3-0ubuntu2:*:*:*:*:*:*:*
canonical apport 2.19.3-0ubuntu3 cpe:2.3:a:canonical:apport:2.19.3-0ubuntu3:*:*:*:*:*:*:*
canonical apport 2.19.4-0ubuntu1 cpe:2.3:a:canonical:apport:2.19.4-0ubuntu1:*:*:*:*:*:*:*
canonical apport 2.19.4-0ubuntu2 cpe:2.3:a:canonical:apport:2.19.4-0ubuntu2:*:*:*:*:*:*:*
canonical apport 2.20-0ubuntu1 cpe:2.3:a:canonical:apport:2.20-0ubuntu1:*:*:*:*:*:*:*
canonical apport 2.20-0ubuntu2 cpe:2.3:a:canonical:apport:2.20-0ubuntu2:*:*:*:*:*:*:*
canonical apport 2.20-0ubuntu3 cpe:2.3:a:canonical:apport:2.20-0ubuntu3:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu1 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu1:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.1 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.1:*:*:*:*:*:*:*

References for CVE-2020-15702

cvelogic Threat Intelligence