CVE-2015-5993: Buffer overflow in form2ping.cgi on Philippine Long Distance Telephone (PLDT) SpeedSurf 504AN devices with fir

This month

HIGH 7.8MITIGATEMITIGATE

CVE-2015-5993 is a high-severity flaw (CVSS 7.8) affecting kasda kw58293 firmware, speedsurf 504an firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in form2ping.cgi on Philippine Long Distance Telephone (PLDT) SpeedSurf 504AN devices with firmware GAN9.8U26-4-TX-R6B018-PH.EN and Kasda KW58293 devices allows remote attackers to cause a denial of service (device outage) via a long ipaddr parameter.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-119
Published	2015-09-21
Last modified	2026-06-17

Publisher (CNA): CERT/CC · Vendor: philippine long distance telephone

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-09-21 10:59 UTCPublished CVE record published
2026-06-17 00:30 UTCUpdated Record last modified

philippine long distance telephone kasda kw58293 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

philippine long distance telephone speedsurf 504an firmware MITIGATE

Affected: gan9.8u26-4-tx-r6b018-hp.en

Fixed in: no fixed release known

Safe to downgrade to: a release before gan9.8u26-4-tx-r6b018-hp.en

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-5993?

kasda kw58293 firmware: mitigate or apply the listed mitigation; speedsurf 504an firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-5993 being exploited?

CVE-2015-5993 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2015-5993 affect?

CVE-2015-5993 affects kasda kw58293 firmware, speedsurf 504an firmware. Severity is high (CVSS 7.8). Buffer overflow in form2ping.cgi on Philippine Long Distance Telephone (PLDT) SpeedSurf 504AN devices with firmware GAN9.8U26-4-TX-R6B018-PH.EN and Kasda KW58293 devices allows remote attackers to cause a denial of service (device outage) v

How urgent is CVE-2015-5993?

Priority 46/100. High severity

Related CVEs

CVE-2015-5992 MEDIUM 4.3 MITIGATE MITIGATE Cross-site scripting (XSS) vulnerability in form2WlanSetup.cgi on Philippine Long Distance Telephone (PLDT) Sp
CVE-2015-5991 MEDIUM 6.8 MITIGATE MITIGATE Cross-site request forgery (CSRF) vulnerability in form2WlanSetup.cgi on Philippine Long Distance Telephone (P

References

← Back to latest CVEs