Vulnerability · Published May 18, 2021 · Assigned by mitre
CVE-2020-23856
Medium 5.5
In plain English
A medium-severity security flaw in the cflow package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.4%top 63.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Use-after-Free vulnerability in cflow 1.6 in the void call(char *name, int line) function at src/parser.c, which could cause a denial of service via the pointer variable caller->callee.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | cflow | 1:1.6-6 | DEBIAN-CVE-2020-23856 |
| Debian:13 | cflow | 1:1.6-6 | DEBIAN-CVE-2020-23856 |
| Debian:14 | cflow | 1:1.6-6 | DEBIAN-CVE-2020-23856 |
| Ubuntu:22.04:LTS | cflow | no fix listed | UBUNTU-CVE-2020-23856 |
| Ubuntu:24.04:LTS | cflow | no fix listed | UBUNTU-CVE-2020-23856 |
| Ubuntu:25.10 | cflow | no fix listed | UBUNTU-CVE-2020-23856 |
| Ubuntu:26.04:LTS | cflow | no fix listed | UBUNTU-CVE-2020-23856 |
| Ubuntu:26.10 | cflow | no fix listed | UBUNTU-CVE-2020-23856 |
Affected products (as reported)
References
- https://lists.gnu.org/archive/html/bug-cflow/2020-07/msg00000.html x_refsource_MISC
- https://github.com/yangjiageng/PoC/blob/master/PoC_cflow_uaf_parser_line1284 x_refsource_MISC
- FEDORA-2021-e8cab459ab vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-6ef76430d0 vendor-advisory, x_refsource_FEDORA