VDB
CVE-2021-20177
CVE-2021-20177
PUBLISHED
A flaw was found in the Linux kernel's implementation of string matching within a packet. A privileged user (with root or CAP_NET_ADMIN) when inserting iptables rules could insert a rule which can panic the system. Kernel before kernel 5.5-rc1 is affected.
EPSS 0.03% · 10.4th percentile
Risk Scores
EPSS Score
0.03%
10.4th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:18.04:LTS | linux-azure-5.3 | *, 5.3.0-1020.21~18.04.1, * |
| Ubuntu:18.04:LTS | linux-aws-5.4 | *, 5.4.0-1018.18~18.04.1, 5.4.0-1020.20~18.04.2 |
| Ubuntu:18.04:LTS | linux-oracle-5.0 | *, *, 0 |
| Ubuntu:Pro:FIPS-updates:20.04:LTS | linux-gcp-fips | 0, 5.4.0-1021.21+fips1 |
| Ubuntu:18.04:LTS | linux-gcp | 5.0.0-1031.32, 5.0.0-1029.30~18.04.1, 5.0.0-1028.29~18.04.1 |
| Ubuntu:18.04:LTS | linux-oracle-5.3 | 0, 5.3.0-1011.12~18.04.1, 5.3.0-1013.14~18.04.1 |
| Ubuntu:18.04:LTS | linux-azure-edge | *, 5.0.0-1012.12~18.04.2, 0 |
| Ubuntu:Pro:FIPS:20.04:LTS | linux-gcp-fips | 0, 5.4.0-1021.21+fips1 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | 6.8.0-2019.20, 0 |
| Ubuntu:18.04:LTS | linux-gkeop-5.4 | 5.4.0-1009.10~18.04.1, 0, 5.4.0-1001.1 |
| Ubuntu:20.04:LTS | linux-kvm | 5.4.0-1018.18, 0, 5.4.0-1008.8 |
| Ubuntu:18.04:LTS | linux-gke-5.4 | 0, 5.4.0-1030.32~18.04.1, 5.4.0-1029.31~18.04.1 |
| Ubuntu:18.04:LTS | linux-raspi-5.4 | 5.4.0-1013.13~18.04.1, 5.4.0-1016.17~18.04.1, 5.4.0-1018.20~18.04.1 |
| Ubuntu:Pro:FIPS-updates:20.04:LTS | linux-aws-fips | 5.4.0-1021.21+fips2, 0 |
| Ubuntu:20.04:LTS | linux-raspi | 5.4.0-1013.13, 5.4.0-1007.7, 5.4.0-1008.8 |
| Ubuntu:18.04:LTS | linux-hwe | 5.0.0-37.40~18.04.1, 0, 5.3.0-28.30~18.04.1 |
| Ubuntu:20.04:LTS | linux-oracle | 5.4.0-1008.8, 5.4.0-1007.7, 5.3.0-1008.9 |
| Ubuntu:18.04:LTS | linux-azure | *, 4.15.0-1025.26, 4.15.0-1012.12 |
| Ubuntu:18.04:LTS | linux-hwe-edge | 5.3.0-23.25~18.04.1, 5.3.0-23.25~18.04.2, 5.3.0-24.26~18.04.2 |
| Ubuntu:20.04:LTS | linux-riscv | 5.4.0-24.28, 5.4.0-34.38, 5.4.0-36.41 |
…and 22 more
Exploit Intelligence
- CVE-2021-3493.yara (github-yara)
- CVE-2021-3493.yara (github-yara)
- CVE-2021-3493.yara (github-yara)
- CVE-2021-3493.yara (github-yara)
- CVE-2021-3493.yara (github-yara)
- CVE-2021-3493.yara (github-yara)
Timeline
- Jan 12, 2021 CVE Published
- May 27, 2021 EPSS Score
- Jun 3, 2021 EPSS Score
- Jun 8, 2021 EPSS Score
- Sep 28, 2021 EPSS Score
- Nov 29, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Jan 29, 2022 EPSS Score
- Mar 31, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- Aug 2, 2022 EPSS Score
- Oct 2, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-20177 third-party-advisory
- https://bugzilla.kernel.org/show_bug.cgi?id=209823 third-party-advisory
- https://ubuntu.com/security/notices/USN-4750-1 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-20177 third-party-advisory