CVE-2021-42870
CVE-2021-42870 is a high-severity vulnerability in Accel-ppp with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 1% (58th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-125
- Affected product: Accel-ppp
- Published:
- Last modified:
Description
ACCEL-PPP 1.12.0 has an out-of-bounds read in post_msg when processing a call_clear_request.
Frequently asked questions
- What is CVE-2021-42870?
- ACCEL-PPP 1.12.0 has an out-of-bounds read in post_msg when processing a call_clear_request.
- How severe is CVE-2021-42870?
- CVE-2021-42870 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2021-42870 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-42870?
- CVE-2021-42870 affects Accel-ppp. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-42870?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-42870 published?
- CVE-2021-42870 was published on 2022-05-16 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:accel-ppp:accel-ppp:1.12.0:*:*:*:*:*:*:*
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- CVE-2022-24704 — Critical (CVSS 9.8): The rad_packet_recv function in opt/src/accel-pppd/radius/packet.c suffers from a buffer overflow vulnerability,…
- CVE-2020-28194 — Critical (CVSS 9.8): Variable underflow exists in accel-ppp radius/packet.c when receiving a RADIUS vendor-specific attribute with length…
- CVE-2020-15173 — High (CVSS 8.2): In ACCEL-PPP (an implementation of PPTP/PPPoE/L2TP/SSTP), there is a buffer overflow when receiving an l2tp control…
- CVE-2021-42054 — High (CVSS 7.5): ACCEL-PPP 1.12.0 has an out-of-bounds read in triton_context_schedule if the client exits after authentication.
All CVEs affecting Accel-ppp →
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