CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-116570
High (7.5) in signalwire freeswitch. EPSS 0.6% estimated probability of exploitation activity in the next 30 days.
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FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to 1.11.2, http_directory_auth() rebuilt an expected user@domain:password credential and base64-encoded it into an 80-byte buffer using an encoder without an output-length argument. A configured credential longer than 57 characters overflowed the stack before the supplied HTTP Basic password was compared. An unauthenticated client only needed to name an existing directory user on an exposed mod_xml_rpc HTTP listener; the module is built but not loaded by the stock configuration. The overflow can corrupt the stack and crash FreeSWITCH, ending every active call, although the overrun bytes come from the configured credential and remote code execution has not been demonstrated. This issue is fixed in version 1.11.2.
Severity
- EPSS
- 0.6% estimated probability of exploitation activity in the next 30 days; 47th percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: yes · Technical impact: partial, assessed 2026-11-09. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWEs
- CWE-121 Stack-based Buffer Overflow
CWE-131 Incorrect Calculation of Buffer Size
CWE-787 Out-of-bounds Write - Published
- Modified
- NVD analysis
- Under analysis
- Record from
- the NVD, synced
Ask an AI about this CVE
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Explain CVE-2026-116570 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-116570?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-116570?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-116570 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| signalwire freeswitch | < 1.11.2 |
Attack patterns (CAPEC)
- CAPEC-47 Buffer Overflow via Parameter Expansion Likelihood: Medium · Severity: High
- CAPEC-100 Overflow Buffers Likelihood: High · Severity: Very High
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.