CVE-2021-22552
CVE-2021-22552 is a medium-severity vulnerability in Google Asylo with a CVSS 3.x base score of 5.3. 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: Medium (CVSS 3.x base score 5.3)
- CVSS v2: 2.1
- EPSS exploit prediction: 0% (5th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-125
- Affected product: Google Asylo
- Published:
- Last modified:
Description
An untrusted memory read vulnerability in Asylo versions up to 0.6.1 allows an untrusted attacker to pass a syscall number in MessageReader that is then used by sysno() and can bypass validation. This can allow the attacker to read memory from within the secure enclave. We recommend updating to Asylo 0.6.3 or past https://github.com/google/asylo/commit/90d7619e9dd99bcdb6cd28c7649d741d254d9a1a
Frequently asked questions
- What is CVE-2021-22552?
- An untrusted memory read vulnerability in Asylo versions up to 0.6.1 allows an untrusted attacker to pass a syscall number in MessageReader that is then used by sysno() and can bypass validation. This can allow the attacker to read memory from within the secure enclave. We recommend updating to Asylo 0.6.3 or past https://github.com/google/asylo/commit/90d7619e9dd99bcdb6cd28c7649d741d254d9a1a
- How severe is CVE-2021-22552?
- CVE-2021-22552 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
- Is CVE-2021-22552 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-22552?
- CVE-2021-22552 affects Google Asylo. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-22552?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-22552 published?
- CVE-2021-22552 was published on 2021-08-02 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:google:asylo:*:*:*:*:*:*:*:*
More vulnerabilities in Google Asylo
- CVE-2021-22550 — Medium (CVSS 6.5): An attacker can modify the pointers in enclave memory to overwrite arbitrary memory addresses within the secure…
- CVE-2021-22549 — Medium (CVSS 6.5): An attacker can modify the address to point to trusted memory to overwrite arbitrary trusted memory. It is recommended…
- CVE-2021-22548 — Medium (CVSS 6.5): An attacker can change the pointer to untrusted memory to point to trusted memory region which causes copying trusted…
- CVE-2020-8904 — Medium (CVSS 6.4): An arbitrary memory overwrite vulnerability in the trusted memory of Asylo exists in versions prior to 0.6.0. As the…
- CVE-2020-8944 — Medium (CVSS 5.3): An arbitrary memory write vulnerability in Asylo versions up to 0.6.0 allows an untrusted attacker to make a call to…
- CVE-2020-8943 — Medium (CVSS 5.3): An arbitrary memory read vulnerability in Asylo versions up to 0.6.0 allows an untrusted attacker to make a call to…
All CVEs affecting Google Asylo →
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