- cvss
- 7.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 42%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Canonical apport 2.20.1-0ubuntu2.24, 2.20.9-0ubuntu7.16, 2.20.11-0ubuntu27.6
- apport Ubuntu 16.04 LTS 2.20.1-0ubuntu2.24
- apport Ubuntu 18.04 LTS 2.20.9-0ubuntu7.16
- apport Ubuntu 20.04 LTS 2.20.11-0ubuntu27.6
- apport Ubuntu Pro 14.04 LTS 2.14.1-0ubuntu3.29+esm5
ubuntu advisories UBUNTU-CVE-2020-15702
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Is CVE-2020-15702 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.50% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 4.4 | AV:L/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- Canonical apport
Classification
- Weakness
-
- CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
References
-
usn.ubuntu.com
/4449-1/
vendor-advisory
-
usn.ubuntu.com
/4449-2/
vendor-advisory
-
usn.ubuntu.com
/4449-1
vendor-advisory
-
zerodayinitiative.com
/advisories/ZDI-20-979/
third-party-advisory, vdb-entry
- seclists.org /fulldisclosure/2025/Jun/9
Sources
- CVE List CVE-2020-15702
- NVD CVE-2020-15702
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.