CVE-2023-27560

HIGH

Math/PrimeField.php in phpseclib 3.x before 3.0.19 has an infinite loop with composite primefields.

Affects 1 product across 1 vendor.

CVSS 3.17.5
EPSS0.8%
Percentile56th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, no confidentiality impact, no integrity impact, full availability impact.
CWE Weakness Definitions
CWE-835: CWE-835
◆ AI Analysis — automated analysis, not human-reviewed

A vulnerability in Math/PrimeField.php in phpseclib 3.x before 3.0.19 can cause an infinite loop when handling composite primefields, potentially leading to denial of service.

BSID: BS-2023-GLOBAL-349052-H • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2023-27560?
A vulnerability in Math/PrimeField.php in phpseclib 3.x before 3.0.19 can cause an infinite loop when handling composite primefields, potentially leading to denial of service.
What is the CVSS score for CVE-2023-27560?
CVE-2023-27560 has CVSS 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS: 0.8%.
Is CVE-2023-27560 actively exploited?
No confirmed active exploitation of CVE-2023-27560 as of 2026-09-25.
How do I remediate CVE-2023-27560?
Priority: HIGH.
What systems are affected by CVE-2023-27560?
CVE-2023-27560 affects Phpseclib Phpseclib.
Vulnerability Details
CVE IDCVE-2023-27560
BSIDBS-2023-GLOBAL-349052-H BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published2023-03-03
Last Modified2026-06-17
ICS Relevance0%
Weakness (CWE)
CWE-835
SourceNVD
Official Description

Math/PrimeField.php in phpseclib 3.x before 3.0.19 has an infinite loop with composite primefields.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

An attacker can exploit this vulnerability by providing specially crafted input to the Math/PrimeField.php component, which may cause the system to enter an infinite loop, consuming excessive CPU resources.

Exploitation Likelihood: MEDIUM

Affected Products
VendorProductAffected Versions
Phpseclib Phpseclib ≥ 3.0.0, < 3.0.19
Remediation

No official vendor advisory link on record. See the CVE record →

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 1323 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hash3961a9205f107cd0cbec6e4f52146ad86ed0b6137f6d67bdd56035a537f67e9aaa6201609381fccd749b36878bd29bf85d2eb6c32623916924a845f4e48726cf
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