CVE-2023-20168: cisco cisco nx-os software Classic Buffer Overflow
CVSS: 7.1v3.1HighModified
Published 23-08-2023Last modified 02-08-2024
Vulnerability summary
CVE-2023-20168 is a high (CVSS 7.1) Classic Buffer Overflow vulnerability in cisco cisco nx-os software. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 13.6% of scored vulnerabilities.
CVSS score
7.1/10
010
High · v3.1 (CVE.org)EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 23-08-2023PublishedVulnerability first disclosed.
- 02-08-2024Last modifiedVulnerability information updated.
Description
A vulnerability in TACACS+ and RADIUS remote authentication for Cisco NX-OS Software could allow an unauthenticated, local attacker to cause an affected device to unexpectedly reload. This vulnerability is due to incorrect input validation when processing an authentication attempt if the directed request option is enabled for TACACS+ or RADIUS. An attacker could exploit this vulnerability by entering a crafted string at the login prompt of an affected device. A successful exploit could allow the attacker to cause the affected device to unexpectedly reload, resulting in a denial of service (DoS) condition.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 7.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HSources2 sources · 6.5–7.1
- NVDNIST6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:HDiffers
EPSS trend
Probability
0.24%
Chance of exploitation in the next 30 days
Percentile
14%
Versus all other CVEs
30-day change
0.00 pp
From 0.24% on 18-09-2026
18-09-202618-10-2026
EPSS score0.24%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Affected systems
Cisco2 products
- cisco nx-os software4.2(1)SV1(4) | 4.2(1)SV1(4a) | 4.2(1)SV1(4b) | 4.2(1)SV1(5.1) | 4.2(1)SV1(5.1a) | 4.2(1)SV1(5.2) | 4.2(1)SV1(5.2b) | 4.2(1)SV2(1.1) | 4.2(1)SV2(1.1a) | 4.2(1)SV2(2.1) | 4.2(1)SV2(2.1a) | 4.2(1)SV2(2.2) | 4.2(1)SV2(2.3) | 5.2(1)SM1(5.1) | 5.2(1)SM1(5.2) | 5.2(1)SM1(5.2a) | 5.2(1)SM1(5.2b) | 5.2(1)SM1(5.2c) | 5.2(1)SM3(1.1) | 5.2(1)SM3(1.1a) | 5.2(1)SM3(1.1b) | 5.2(1)SM3(1.1c) | 5.2(1)SM3(2.1) | 5.2(1)SV3(1.4) | 5.2(1)SV3(1.1) | 5.2(1)SV3(1.3) | 5.2(1)SV3(1.5a) | 5.2(1)SV3(1.5b) | 5.2(1)SV3(1.6) | 5.2(1)SV3(1.10) | 5.2(1)SV3(1.15) | 5.2(1)SV3(2.1) | 5.2(1)SV3(2.5) | 5.2(1)SV3(2.8) | 5.2(1)SV3(3.1) | 5.2(1)SV3(1.2) | 5.2(1)SV3(1.4b) | 5.2(1)SV3(3.15) | 5.2(1)SV3(4.1) | 5.2(1)SV3(4.1a) | 5.2(1)SV3(4.1b) | 5.2(1)SV3(4.1c) | 6.0(2)A3(1) | 6.0(2)A3(2) | 6.0(2)A3(4) | 6.0(2)A4(1) | 6.0(2)A4(2) | 6.0(2)A4(3) | 6.0(2)A4(4) | 6.0(2)A4(5) | 6.0(2)A4(6) | 6.0(2)A6(1) | 6.0(2)A6(1a) | 6.0(2)A6(2) | 6.0(2)A6(2a) | 6.0(2)A6(3) | 6.0(2)A6(3a) | 6.0(2)A6(4) | 6.0(2)A6(4a) | 6.0(2)A6(5) | 6.0(2)A6(5a) | 6.0(2)A6(5b) | 6.0(2)A6(6) | 6.0(2)A6(7) | 6.0(2)A6(8) | 6.0(2)A7(1) | 6.0(2)A7(1a) | 6.0(2)A7(2) | 6.0(2)A7(2a) | 6.0(2)A8(1) | 6.0(2)A8(2) | 6.0(2)A8(3) | 6.0(2)A8(4) | 6.0(2)A8(4a) | 6.0(2)A8(5) | 6.0(2)A8(6) | 6.0(2)A8(7) | 6.0(2)A8(7a) | 6.0(2)A8(7b) | 6.0(2)A8(8) | 6.0(2)A8(9) | 6.0(2)A8(10a) | 6.0(2)A8(10) | 6.0(2)A8(11) | 6.0(2)A8(11a) | 6.0(2)A8(11b) | 6.0(2)U2(1) | 6.0(2)U2(2) | 6.0(2)U2(3) | 6.0(2)U2(4) | 6.0(2)U2(5) | 6.0(2)U2(6) | 6.0(2)U3(1) | 6.0(2)U3(2) | 6.0(2)U3(3) | 6.0(2)U3(4) | 6.0(2)U3(5) | 6.0(2)U3(6) | 6.0(2)U3(7) | 6.0(2)U3(8) | 6.0(2)U3(9) | 6.0(2)U4(1) | 6.0(2)U4(2) | 6.0(2)U4(3) | 6.0(2)U4(4) | 6.0(2)U5(1) | 6.0(2)U5(2) | 6.0(2)U5(3) | 6.0(2)U5(4) | 6.0(2)U6(1) | 6.0(2)U6(2) | 6.0(2)U6(3) | 6.0(2)U6(4) | 6.0(2)U6(5) | 6.0(2)U6(6) | 6.0(2)U6(7) | 6.0(2)U6(8) | 6.0(2)U6(1a) | 6.0(2)U6(2a) | 6.0(2)U6(3a) | 6.0(2)U6(4a) | 6.0(2)U6(5a) | 6.0(2)U6(5b) | 6.0(2)U6(5c) | 6.0(2)U6(9) | 6.0(2)U6(10) | 6.2(2) | 6.2(2a) | 6.2(6) | 6.2(6b) | 6.2(8) | 6.2(8a) | 6.2(8b) | 6.2(10) | 6.2(12) | 6.2(18) | 6.2(16) | 6.2(14) | 6.2(6a) | 6.2(20) | 6.2(1) | 6.2(3) | 6.2(5) | 6.2(5a) | 6.2(5b) | 6.2(7) | 6.2(9) | 6.2(9a) | 6.2(9b) | 6.2(9c) | 6.2(11) | 6.2(11b) | 6.2(11c) | 6.2(11d) | 6.2(11e) | 6.2(13) | 6.2(13a) | 6.2(13b) | 6.2(15) | 6.2(17) | 6.2(19) | 6.2(21) | 6.2(23) | 6.2(20a) | 6.2(25) | 6.2(22) | 6.2(27) | 6.2(29) | 6.2(24) | 6.2(31) | 6.2(24a) | 6.2(33) | 7.0(3)F1(1) | 7.0(3)F2(1) | 7.0(3)F2(2) | 7.0(3)F3(1) | 7.0(3)F3(2) | 7.0(3)F3(3) | 7.0(3)F3(3a) | 7.0(3)F3(4) | 7.0(3)F3(3c) | 7.0(3)F3(5) | 7.0(3)I2(2a) | 7.0(3)I2(2b) | 7.0(3)I2(2c) | 7.0(3)I2(2d) | 7.0(3)I2(2e) | 7.0(3)I2(3) | 7.0(3)I2(4) | 7.0(3)I2(5) | 7.0(3)I2(1) | 7.0(3)I2(1a) | 7.0(3)I2(2) | 7.0(3)I3(1) | 7.0(3)I4(1) | 7.0(3)I4(2) | 7.0(3)I4(3) | 7.0(3)I4(4) | 7.0(3)I4(5) | 7.0(3)I4(6) | 7.0(3)I4(7) | 7.0(3)I4(8) | 7.0(3)I4(8a) | 7.0(3)I4(8b) | 7.0(3)I4(8z) | 7.0(3)I4(9) | 7.0(3)I5(1) | 7.0(3)I5(2) | 7.0(3)I6(1) | 7.0(3)I6(2) | 7.0(3)I7(1) | 7.0(3)I7(2) | 7.0(3)I7(3) | 7.0(3)I7(4) | 7.0(3)I7(5) | 7.0(3)I7(5a) | 7.0(3)I7(6) | 7.0(3)I7(7) | 7.0(3)I7(8) | 7.0(3)I7(9) | 7.0(3)I7(10) | 7.1(0)N1(1a) | 7.1(0)N1(1b) | 7.1(0)N1(1) | 7.1(1)N1(1) | 7.1(2)N1(1) | 7.1(3)N1(1) | 7.1(3)N1(2) | 7.1(4)N1(1) | 7.1(5)N1(1) | 7.1(5)N1(1b) | 7.2(0)D1(1) | 7.2(1)D1(1) | 7.2(2)D1(2) | 7.2(2)D1(1) | 7.3(0)D1(1) | 7.3(0)DX(1) | 7.3(0)DY(1) | 7.3(0)N1(1) | 7.3(1)D1(1) | 7.3(1)DY(1) | 7.3(1)N1(1) | 7.3(2)D1(1) | 7.3(2)D1(2) | 7.3(2)D1(3) | 7.3(2)D1(3a) | 7.3(2)N1(1) | 7.3(3)N1(1) | 8.0(1) | 8.1(1) | 8.1(2) | 8.1(2a) | 8.1(1a) | 8.1(1b) | 8.2(1) | 8.2(2) | 8.2(3) | 8.2(4) | 8.2(5) | 8.2(6) | 8.2(7) | 8.2(7a) | 8.2(8) | 8.2(9) | 8.3(1) | 8.3(2) | 9.2(1) | 9.2(2) | 9.2(2t) | 9.2(3) | 9.2(4) | 9.2(2v) | 9.2(1a) | 7.3(4)N1(1) | 7.3(3)D1(1) | 7.3(4)D1(1) | 7.3(5)N1(1) | 5.2(1)SK3(1.1) | 5.2(1)SK3(2.1) | 5.2(1)SK3(2.2) | 5.2(1)SK3(2.2b) | 5.2(1)SK3(2.1a) | 5.2(1)SV5(1.1) | 5.2(1)SV5(1.2) | 5.2(1)SV5(1.3) | 5.2(1)SV5(1.3a) | 5.2(1)SV5(1.3b) | 5.2(1)SV5(1.3c) | 8.4(1) | 8.4(1a) | 8.4(2) | 8.4(2a) | 8.4(3) | 8.4(2b) | 8.4(4) | 8.4(2c) | 8.4(4a) | 8.4(5) | 8.4(2d) | 8.4(6) | 8.4(2e) | 8.4(6a) | 8.4(7) | 8.4(2f) | 9.3(1) | 9.3(2) | 9.3(3) | 9.3(4) | 9.3(5) | 9.3(6) | 9.3(7) | 9.3(7a) | 9.3(8) | 9.3(9) | 9.3(10) | 9.3(11) | 7.3(6)N1(1) | 7.3(5)D1(1) | 7.3(7)N1(1) | 7.3(7)N1(1a) | 7.3(7)N1(1b) | 7.3(6)D1(1) | 7.3(8)N1(1) | 7.3(7)D1(1) | 7.3(9)N1(1) | 10.1(1) | 10.1(2) | 10.1(2t) | 8.5(1) | 7.3(10)N1(1) | 7.3(8)D1(1) | 10.2(1) | 10.2(1q) | 10.2(2) | 10.2(3) | 10.2(3t) | 10.2(4) | 10.2(5) | 7.3(9)D1(1) | 7.3(11)N1(1) | 7.3(12)N1(1) | 10.3(1) | 10.3(2) | 7.3(13)N1(1)
- nx-os9.3\(11\) | 10.2\(5\) | na
1 vendor · 2 products
References
1 links- sec.cloudapps.cisco.com/security/…Vendor Advisory