CVE-2025-44952: open5gs · Classic Buffer Overflow
Affects open5gsSource CVE Database V5
Not known to be exploited · CVSS 7.8 High.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 18 Jun 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
GitHubopen5gs/open5gspkg:github/open5gs/open5gsOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
- Immediate mitigation should focus on restricting local access to systems running Open5GS SMF and UPF components, enforcing strict access controls and monitoring for unauthorized user activity.
- Implement application-level sandboxing or process isolation to limit the impact of potential exploitation within the PFCP library processes.
- Conduct thorough input validation and sanitization on the `session.dnn` field at higher layers if possible, to prevent oversized values from reaching the vulnerable function.
- Monitor logs and network traffic for anomalous PFCP messages or unusual session parameter modifications that could indicate exploitation attempts.
- Engage with the Open5GS community or vendors for updates and patches addressing this vulnerability, and plan for rapid deployment once available.
- Consider deploying intrusion detection or prevention systems tailored to 5G core protocols to detect exploitation attempts.
- Perform regular security audits and penetration testing focused on 5G core components to identify and remediate similar vulnerabilities proactively.
Description
A missing length check in `ogs_pfcp_subnet_add` function from PFCP library, used by both smf and upf in open5gs 2.7.2 and earlier, allows a local attacker to cause a Buffer Overflow by changing the `session.dnn` field with a value with length greater than 101.