NVD / CVE Program· CNA cisco

CVE-2024-20450: Multiple vulnerabilities in the web-based management interface of Cisco Small Business SPA300 Series IP Phones and Cisco Small Business…

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Plan (action score 41/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 7.2% (FIRST EPSS); higher than 94.4% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
According to the record, no fixed version is available yet.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Add it to your regular patch cycle. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Multiple vulnerabilities in the web-based management interface of Cisco Small Business SPA300 Series IP Phones and Cisco Small Business SPA500 Series IP Phones could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system with root privileges. These vulnerabilities exist because incoming HTTP packets are not properly checked for errors, which could result in a buffer overflow. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to overflow an internal buffer and execute arbitrary commands at the root privilege level.

BDU:2024-06098

Published: Aug 7, 2024
Updated: Jun 17, 2026
EPSS: 7.2% · 94th percentile
CWE: CWE-120

Report tools

JSON

Action score

Plan

Add it to your regular patch cycle.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 2 / 30 · 7.2%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 9.8
CNA · cisco: 9.8; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
cisco	spa 301 firmware	cpe:2.3:o:cisco:spa_301_firmware
cisco	spa 301 1 line ip phone	cpe:2.3:h:cisco:spa_301_1_line_ip_phone
cisco	spa 303 firmware	cpe:2.3:o:cisco:spa_303_firmware
cisco	spa 303 3 line ip phone	cpe:2.3:h:cisco:spa_303_3_line_ip_phone
cisco	spa 501g firmware	cpe:2.3:o:cisco:spa_501g_firmware
cisco	spa 501g 8-line ip phone	cpe:2.3:h:cisco:spa_501g_8-line_ip_phone
cisco	spa 502g firmware	cpe:2.3:o:cisco:spa_502g_firmware
cisco	spa 502g 1-line ip phone	cpe:2.3:h:cisco:spa_502g_1-line_ip_phone
cisco	spa 504g firmware	cpe:2.3:o:cisco:spa_504g_firmware
cisco	spa 504g 4-line ip phone	cpe:2.3:h:cisco:spa_504g_4-line_ip_phone
cisco	spa 508g firmware	cpe:2.3:o:cisco:spa_508g_firmware
cisco	spa 508g 8-line ip phone	cpe:2.3:h:cisco:spa_508g_8-line_ip_phone

and 10 more

Versions reported by the vendor

Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.

Cisco Cisco Small Business IP Phones
- 7.6.0, 7.6.2, 7.6.2SR3, 7.6.2SR6, 7.6.2SR2, 7.6.2SR4, 7.6.2SR1, 7.6.2SR5, 7.6.2SR7, 7.6.1, 7.3.7, 7.5.5 … (+21)affected

Affected versions · NVD (11)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

cisco spa 301 firmwareall versions
cisco spa 303 firmwareall versions
cisco spa 501g firmwareall versions
cisco spa 502g firmwareall versions
cisco spa 504g firmwareall versions
cisco spa 508g firmwareall versions
cisco spa 509g firmwareall versions
cisco spa 512g firmwareall versions
cisco spa 514g firmwareall versions
cisco spa 525g firmwareall versions
cisco spa 525g2 firmwareall versions

Same product

cisco: all records

Other highest-scoring records for the same primary product.

CVE-2024-20454Multiple vulnerabilities in the web-based management interface of Cisco Small Business SPA300 Series IP Phones and Cisco Small Business…
41Plan
CVE-2017-12219A vulnerability in the handling of IP fragments for the Cisco Small Business SPA300, SPA500, and SPA51x Series IP Phones could allow an…
31Monitor
CVE-2024-20451Multiple vulnerabilities in the web-based management interface of Cisco Small Business SPA300 Series IP Phones and Cisco Small Business…
30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2024-204540 days apartMultiple vulnerabilities in the web-based management interface of Cisco Small Business SPA300 Series IP Phones and Cisco Small Business…
41Plan
CVE-2024-204510 days apartMultiple vulnerabilities in the web-based management interface of Cisco Small Business SPA300 Series IP Phones and Cisco Small Business…
30Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-24-1178 · Aug 8, 2024(Cisco IP Telefon Güvenlik Bildirimi)

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log (0)

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-spa-http-vulns-RJZmX2Xz

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records