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CVE-2025-68160— Heap out-of-bounds write in BIO_f_linebuffer on short writes

Quick assessment

Affected
OpenSSL OpenSSL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL 3.6版本、3.5版本、3.4版本、3.3版本、3.0版本、1.1.1版本和1.0.2版本存在安全漏洞，该漏洞源于行缓冲BIO过滤器处理不当，可能导致基于堆的越界写入和内存损坏。

AI Predicted 5.5 Difficulty: Hard EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 7

VendorProduct Version RangeStatus
OpenSSL OpenSSL 3.6.0< 3.6.1 affected
3.5.0< 3.5.5 affected
3.4.0< 3.4.4 affected
3.3.0< 3.3.6 affected
3.0.0< 3.0.19 affected
1.1.1< 1.1.1ze affected
1.0.2< 1.0.2zn affected
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I. Basic Information for CVE-2025-68160

Vulnerability Information
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Vulnerability Title
Heap out-of-bounds write in BIO_f_linebuffer on short writes
Source: CVE Program / CVE List V5
Vulnerability Description
Issue summary: Writing large, newline-free data into a BIO chain using the line-buffering filter where the next BIO performs short writes can trigger a heap-based out-of-bounds write. Impact summary: This out-of-bounds write can cause memory corruption which typically results in a crash, leading to Denial of Service for an application. The line-buffering BIO filter (BIO_f_linebuffer) is not used by default in TLS/SSL data paths. In OpenSSL command-line applications, it is typically only pushed onto stdout/stderr on VMS systems. Third-party applications that explicitly use this filter with a BIO chain that can short-write and that write large, newline-free data influenced by an attacker would be affected. However, the circumstances where this could happen are unlikely to be under attacker control, and BIO_f_linebuffer is unlikely to be handling non-curated data controlled by an attacker. For that reason the issue was assessed as Low severity. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the BIO implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSSL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL 3.6版本、3.5版本、3.4版本、3.3版本、3.0版本、1.1.1版本和1.0.2版本存在安全漏洞，该漏洞源于行缓冲BIO过滤器处理不当，可能导致基于堆的越界写入和内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenSSL OpenSSL 3.6.0 ~ 3.6.1 -

II. Public POCs for CVE-2025-68160

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III. Intelligence Information for CVE-2025-68160

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Vendor Advisories for CVE-2025-68160 (1)

Same Patch Batch · OpenSSL · 2026-01-27 · 12 CVEs total

CVE-2026-22795 Missing ASN1_TYPE validation in PKCS#12 parsing
CVE-2026-22796 ASN1_TYPE Type Confusion in the PKCS7_digest_from_attributes() function
CVE-2025-15467 Stack buffer overflow in CMS (Auth)EnvelopedData parsing
CVE-2025-15469 'openssl dgst' one-shot codepath silently truncates inputs >16MB
CVE-2025-15468 NULL dereference in SSL_CIPHER_find() function on unknown cipher ID
CVE-2025-66199 TLS 1.3 CompressedCertificate excessive memory allocation
CVE-2025-11187 Improper validation of PBMAC1 parameters in PKCS#12 MAC verification
CVE-2025-69421 NULL Pointer Dereference in PKCS12_item_decrypt_d2i_ex function
CVE-2025-69420 Missing ASN1_TYPE validation in TS_RESP_verify_response() function
CVE-2025-69419 Out of bounds write in PKCS12_get_friendlyname() UTF-8 conversion
CVE-2025-69418 Unauthenticated/unencrypted trailing bytes with low-level OCB function calls

IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL
Same weakness: CWE-787

V. Comments for CVE-2025-68160

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