CVE-2021-21778
CVE-2021-21778 is a high-severity vulnerability in Mz-automation Lib60870 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-617.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 1% (66th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-617
- Affected product: Mz-automation Lib60870
- Published:
- Last modified:
Description
A denial of service vulnerability exists in the ASDU message processing functionality of MZ Automation GmbH lib60870.NET 2.2.0. A specially crafted network request can lead to loss of communications. An attacker can send an unauthenticated message to trigger this vulnerability.
Frequently asked questions
- What is CVE-2021-21778?
- A denial of service vulnerability exists in the ASDU message processing functionality of MZ Automation GmbH lib60870.NET 2.2.0. A specially crafted network request can lead to loss of communications. An attacker can send an unauthenticated message to trigger this vulnerability.
- How severe is CVE-2021-21778?
- CVE-2021-21778 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-2021-21778 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-21778?
- CVE-2021-21778 affects Mz-automation Lib60870. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-21778?
- 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-2021-21778 published?
- CVE-2021-21778 was published on 2021-08-25 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:mz-automation:lib60870:2.2.0:*:*:*:*:*:*:*
More vulnerabilities in Mz-automation Lib60870
- CVE-2021-45773 — High (CVSS 7.5): A NULL pointer dereference in CS104_IPAddress_setFromString at src/iec60870/cs104/cs104_slave.c of lib60870 commit…
- CVE-2019-6137 — High (CVSS 7.5): An issue was discovered in lib60870 2.1.1. LinkLayer_setAddress in link_layer/link_layer.c has a NULL pointer…
- CVE-2023-23205 — Medium (CVSS 5.5): An issue was discovered in lib60870 v2.3.2. There is a memory leak in…
All CVEs affecting Mz-automation Lib60870 →
Other CWE-617 (Reachable Assertion) vulnerabilities
- CVE-2020-3615 — Critical (CVSS 9.8): Valid deauth/disassoc frames is dropped in case if RMF is enabled and some rouge peer keep on sending rogue…
- CVE-2019-9795 — Critical (CVSS 9.8): A vulnerability where type-confusion in the IonMonkey just-in-time (JIT) compiler could potentially be used by…
- CVE-2026-31739 — High (CVSS 8.8): In the Linux kernel, the following vulnerability has been resolved: crypto: tegra - Add missing CRYPTO_ALG_ASYNC The…
- CVE-2020-12417 — High (CVSS 8.8): Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in…
- CVE-2020-6623 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
- CVE-2020-6619 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__buf_seek.