CVE-2024-20263A vulnerability with the access control list (ACL) management within a stacked switch configuration of Cisco Business 250 Series Smart…
- 5.8MediumCVSS base score
- 0.45%Exploitation in 30 daysEPSS · top 60% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability with the access control list (ACL) management within a stacked switch configuration of Cisco Business 250 Series Smart Switches and Business 350 Series Managed Switches could allow an unauthenticated, remote attacker to bypass protection offered by a configured ACL on an affected device. This vulnerability is due to incorrect processing of ACLs on a stacked configuration when either the primary or backup switches experience a full stack reload or power cycle. An attacker could exploit this vulnerability by sending crafted traffic through an affected device. A successful exploit could allow the attacker to bypass configured ACLs, causing traffic to be dropped or forwarded in an unexpected manner. The attacker does not have control over the conditions that result in the device being in the vulnerable state. Note: In the vulnerable state, the ACL would be correctly applied on the primary devices but could be incorrectly applied to the backup devices.
Timeline
ID reserved
By cisco
- 3 months later
· 3 months later
Published
- 10 months later
· 10 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
| NVDNVD · Modified | 3.1 | High7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L |
- EPSS (exploitation in 30 days)
- 0.45% · top 60% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.8.
Affected products
Cisco · Cisco Small Business Smart and Managed Switches
- affected 2.0.0.73
- affected 2.1.0.63
- affected 2.2.0.63
- affected 2.2.0.66
- affected 2.2.5.68
- affected 2.2.7.07
- affected 2.2.8.04
- affected 2.3.0.130
- affected 2.3.5.63
- affected 2.4.0.91
- affected 2.4.0.94
- affected 2.4.5.71
- affected 2.5.0.78
- affected 2.5.0.79
- affected 2.5.0.82
- affected 2.5.0.83
- affected 2.5.0.89
- affected 2.5.0.90
- affected 2.5.0.92
- affected 2.5.5.47
- affected 2.5.7.85
- affected 2.5.8.12
- affected 2.5.8.15
- affected 2.5.9.13
- affected 2.5.9.15
- affected 2.5.9.16
- affected 3.0.0.61
- affected 3.0.0.69
- affected 3.1.0.57
- affected 3.1.1.7
- affected 3.2.0.84
- affected 3.2.0.89
- affected 3.2.1.1
- affected 3.3.0.16
What to do
Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
References
References1
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-17978 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-20263)Record last updated .