Security readout for executives and security teams
Plain-English summary
CVE-2020-25577 affects FreeBSD systems where rtsold processes a malformed RDNSS option without first confirming it stays inside the received packet. The reported risk is an overflow in userspace software that assumes the kernel already validated the packet. Business urgency depends on whether affected FreeBSD versions are present.
Executive priority
Treat this as a targeted patch validation item for FreeBSD-based infrastructure, not an internet-wide emergency based on the provided evidence. Prioritize systems on affected versions, especially where operational dependency on rtsold exists.
Technical view
FreeBSD rtsold(8) before the listed fixed releases/revisions lacks a bounds check for the RDNSS option length. The source says the kernel currently ignores malformed packets but still passes them to userspace, creating overflow risk for programs that rely on kernel validation.
Likely exposure
Exposure is most likely on FreeBSD 12.2-RELEASE before p1, 12.1-RELEASE before p11, 11.4-RELEASE before p5, or affected STABLE revisions. Evidence for other affected products is limited to the NetApp advisory reference.
Exploitation context
The provided sources do not state active exploitation, and this CVE is not marked KEV in the bundle. The available description indicates malformed packet handling risk, but does not provide exploit maturity, attack prevalence, or confirmed exploitation.
Researcher notes
The key condition is missing packet-boundary validation before rtsold processes RDNSS contents. The source bundle does not include CVSS, CWE, proof of exploitation, or detailed product impact beyond FreeBSD and a NetApp advisory reference.
Mitigation direction
- Upgrade FreeBSD to the fixed release patch level or later.
- Use r368250 or later for FreeBSD 12.2-STABLE.
- Use r368253 or later for FreeBSD 11.4-STABLE.
- Review FreeBSD-SA-20:32.rtsold for branch-specific remediation guidance.
- Review NetApp advisory guidance where NetApp products are in scope.
Validation and detection
- Inventory systems running FreeBSD 11.4, 12.1, or 12.2.
- Confirm each system's release patch level or STABLE revision.
- Check whether rtsold is present or operationally relevant.
- Compare versions against the fixed levels in the FreeBSD advisory.
- For NetApp assets, confirm product impact through the NetApp advisory.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2020-25577 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://security.freebsd.org/advisories/FreeBSD-SA-20:32.rtsold.ascCVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210423-0001/CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.