High severity8.8NVD Advisory· Published Dec 19, 2021· Updated Jun 17, 2026
CVE-2021-43083
CVE-2021-43083
Description
Apache PLC4X - PLC4C (Only the C language implementation was effected) was vulnerable to an unsigned integer underflow flaw inside the tcp transport. Users should update to 0.9.1, which addresses this issue. However, in order to exploit this vulnerability, a user would have to actively connect to a mallicious device which could send a response with invalid content. Currently we consider the probability of this being exploited as quite minimal, however this could change in the future, especially with the industrial networks growing more and more together.
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Affected products
3- Apache Software Foundation/Apache PLC4Xv5Range: PLC4C
Patches
Vulnerability mechanics
References
2- www.openwall.com/lists/oss-security/2021/12/20/2nvdMailing ListThird Party Advisory
- lists.apache.org/thread/jxx6qc84z60xbbhn6vp2s5qf09psrtc7nvdVendor Advisory
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